Ejemplo n.º 1
0
/* Subroutine */ int cerrpo_(char *path, integer *nunit)
{
    /* System generated locals */
    integer i__1;
    real r__1, r__2;
    complex q__1;

    /* Local variables */
    complex a[16]	/* was [4][4] */, b[4];
    integer i__, j;
    real r__[4];
    complex w[8], x[4];
    char c2[2];
    real r1[4], r2[4];
    complex af[16]	/* was [4][4] */;
    integer info;
    real anrm, rcond;

    /* Fortran I/O blocks */
    static cilist io___1 = { 0, 0, 0, 0, 0 };



/*  -- LAPACK test routine (version 3.1) -- */
/*     Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd.. */
/*     November 2006 */

/*     .. Scalar Arguments .. */
/*     .. */

/*  Purpose */
/*  ======= */

/*  CERRPO tests the error exits for the COMPLEX routines */
/*  for Hermitian positive definite matrices. */

/*  Arguments */
/*  ========= */

/*  PATH    (input) CHARACTER*3 */
/*          The LAPACK path name for the routines to be tested. */

/*  NUNIT   (input) INTEGER */
/*          The unit number for output. */

/*  ===================================================================== */

/*     .. Parameters .. */
/*     .. */
/*     .. Local Scalars .. */
/*     .. */
/*     .. Local Arrays .. */
/*     .. */
/*     .. External Functions .. */
/*     .. */
/*     .. External Subroutines .. */
/*     .. */
/*     .. Scalars in Common .. */
/*     .. */
/*     .. Common blocks .. */
/*     .. */
/*     .. Intrinsic Functions .. */
/*     .. */
/*     .. Executable Statements .. */

    infoc_1.nout = *nunit;
    io___1.ciunit = infoc_1.nout;
    s_wsle(&io___1);
    e_wsle();
    s_copy(c2, path + 1, (ftnlen)2, (ftnlen)2);

/*     Set the variables to innocuous values. */

    for (j = 1; j <= 4; ++j) {
	for (i__ = 1; i__ <= 4; ++i__) {
	    i__1 = i__ + (j << 2) - 5;
	    r__1 = 1.f / (real) (i__ + j);
	    r__2 = -1.f / (real) (i__ + j);
	    q__1.r = r__1, q__1.i = r__2;
	    a[i__1].r = q__1.r, a[i__1].i = q__1.i;
	    i__1 = i__ + (j << 2) - 5;
	    r__1 = 1.f / (real) (i__ + j);
	    r__2 = -1.f / (real) (i__ + j);
	    q__1.r = r__1, q__1.i = r__2;
	    af[i__1].r = q__1.r, af[i__1].i = q__1.i;
/* L10: */
	}
	i__1 = j - 1;
	b[i__1].r = 0.f, b[i__1].i = 0.f;
	r1[j - 1] = 0.f;
	r2[j - 1] = 0.f;
	i__1 = j - 1;
	w[i__1].r = 0.f, w[i__1].i = 0.f;
	i__1 = j - 1;
	x[i__1].r = 0.f, x[i__1].i = 0.f;
/* L20: */
    }
    anrm = 1.f;
    infoc_1.ok = TRUE_;

/*     Test error exits of the routines that use the Cholesky */
/*     decomposition of a Hermitian positive definite matrix. */

    if (lsamen_(&c__2, c2, "PO")) {

/*        CPOTRF */

	s_copy(srnamc_1.srnamt, "CPOTRF", (ftnlen)32, (ftnlen)6);
	infoc_1.infot = 1;
	cpotrf_("/", &c__0, a, &c__1, &info);
	chkxer_("CPOTRF", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 2;
	cpotrf_("U", &c_n1, a, &c__1, &info);
	chkxer_("CPOTRF", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 4;
	cpotrf_("U", &c__2, a, &c__1, &info);
	chkxer_("CPOTRF", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);

/*        CPOTF2 */

	s_copy(srnamc_1.srnamt, "CPOTF2", (ftnlen)32, (ftnlen)6);
	infoc_1.infot = 1;
	cpotf2_("/", &c__0, a, &c__1, &info);
	chkxer_("CPOTF2", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 2;
	cpotf2_("U", &c_n1, a, &c__1, &info);
	chkxer_("CPOTF2", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 4;
	cpotf2_("U", &c__2, a, &c__1, &info);
	chkxer_("CPOTF2", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);

/*        CPOTRI */

	s_copy(srnamc_1.srnamt, "CPOTRI", (ftnlen)32, (ftnlen)6);
	infoc_1.infot = 1;
	cpotri_("/", &c__0, a, &c__1, &info);
	chkxer_("CPOTRI", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 2;
	cpotri_("U", &c_n1, a, &c__1, &info);
	chkxer_("CPOTRI", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 4;
	cpotri_("U", &c__2, a, &c__1, &info);
	chkxer_("CPOTRI", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);

/*        CPOTRS */

	s_copy(srnamc_1.srnamt, "CPOTRS", (ftnlen)32, (ftnlen)6);
	infoc_1.infot = 1;
	cpotrs_("/", &c__0, &c__0, a, &c__1, b, &c__1, &info);
	chkxer_("CPOTRS", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 2;
	cpotrs_("U", &c_n1, &c__0, a, &c__1, b, &c__1, &info);
	chkxer_("CPOTRS", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 3;
	cpotrs_("U", &c__0, &c_n1, a, &c__1, b, &c__1, &info);
	chkxer_("CPOTRS", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 5;
	cpotrs_("U", &c__2, &c__1, a, &c__1, b, &c__2, &info);
	chkxer_("CPOTRS", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 7;
	cpotrs_("U", &c__2, &c__1, a, &c__2, b, &c__1, &info);
	chkxer_("CPOTRS", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);

/*        CPORFS */

	s_copy(srnamc_1.srnamt, "CPORFS", (ftnlen)32, (ftnlen)6);
	infoc_1.infot = 1;
	cporfs_("/", &c__0, &c__0, a, &c__1, af, &c__1, b, &c__1, x, &c__1, 
		r1, r2, w, r__, &info);
	chkxer_("CPORFS", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 2;
	cporfs_("U", &c_n1, &c__0, a, &c__1, af, &c__1, b, &c__1, x, &c__1, 
		r1, r2, w, r__, &info);
	chkxer_("CPORFS", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 3;
	cporfs_("U", &c__0, &c_n1, a, &c__1, af, &c__1, b, &c__1, x, &c__1, 
		r1, r2, w, r__, &info);
	chkxer_("CPORFS", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 5;
	cporfs_("U", &c__2, &c__1, a, &c__1, af, &c__2, b, &c__2, x, &c__2, 
		r1, r2, w, r__, &info);
	chkxer_("CPORFS", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 7;
	cporfs_("U", &c__2, &c__1, a, &c__2, af, &c__1, b, &c__2, x, &c__2, 
		r1, r2, w, r__, &info);
	chkxer_("CPORFS", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 9;
	cporfs_("U", &c__2, &c__1, a, &c__2, af, &c__2, b, &c__1, x, &c__2, 
		r1, r2, w, r__, &info);
	chkxer_("CPORFS", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 11;
	cporfs_("U", &c__2, &c__1, a, &c__2, af, &c__2, b, &c__2, x, &c__1, 
		r1, r2, w, r__, &info);
	chkxer_("CPORFS", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);

/*        CPOCON */

	s_copy(srnamc_1.srnamt, "CPOCON", (ftnlen)32, (ftnlen)6);
	infoc_1.infot = 1;
	cpocon_("/", &c__0, a, &c__1, &anrm, &rcond, w, r__, &info)
		;
	chkxer_("CPOCON", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 2;
	cpocon_("U", &c_n1, a, &c__1, &anrm, &rcond, w, r__, &info)
		;
	chkxer_("CPOCON", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 4;
	cpocon_("U", &c__2, a, &c__1, &anrm, &rcond, w, r__, &info)
		;
	chkxer_("CPOCON", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 5;
	r__1 = -anrm;
	cpocon_("U", &c__1, a, &c__1, &r__1, &rcond, w, r__, &info)
		;
	chkxer_("CPOCON", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);

/*        CPOEQU */

	s_copy(srnamc_1.srnamt, "CPOEQU", (ftnlen)32, (ftnlen)6);
	infoc_1.infot = 1;
	cpoequ_(&c_n1, a, &c__1, r1, &rcond, &anrm, &info);
	chkxer_("CPOEQU", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 3;
	cpoequ_(&c__2, a, &c__1, r1, &rcond, &anrm, &info);
	chkxer_("CPOEQU", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);

/*     Test error exits of the routines that use the Cholesky */
/*     decomposition of a Hermitian positive definite packed matrix. */

    } else if (lsamen_(&c__2, c2, "PP")) {

/*        CPPTRF */

	s_copy(srnamc_1.srnamt, "CPPTRF", (ftnlen)32, (ftnlen)6);
	infoc_1.infot = 1;
	cpptrf_("/", &c__0, a, &info);
	chkxer_("CPPTRF", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 2;
	cpptrf_("U", &c_n1, a, &info);
	chkxer_("CPPTRF", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);

/*        CPPTRI */

	s_copy(srnamc_1.srnamt, "CPPTRI", (ftnlen)32, (ftnlen)6);
	infoc_1.infot = 1;
	cpptri_("/", &c__0, a, &info);
	chkxer_("CPPTRI", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 2;
	cpptri_("U", &c_n1, a, &info);
	chkxer_("CPPTRI", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);

/*        CPPTRS */

	s_copy(srnamc_1.srnamt, "CPPTRS", (ftnlen)32, (ftnlen)6);
	infoc_1.infot = 1;
	cpptrs_("/", &c__0, &c__0, a, b, &c__1, &info);
	chkxer_("CPPTRS", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 2;
	cpptrs_("U", &c_n1, &c__0, a, b, &c__1, &info);
	chkxer_("CPPTRS", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 3;
	cpptrs_("U", &c__0, &c_n1, a, b, &c__1, &info);
	chkxer_("CPPTRS", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 6;
	cpptrs_("U", &c__2, &c__1, a, b, &c__1, &info);
	chkxer_("CPPTRS", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);

/*        CPPRFS */

	s_copy(srnamc_1.srnamt, "CPPRFS", (ftnlen)32, (ftnlen)6);
	infoc_1.infot = 1;
	cpprfs_("/", &c__0, &c__0, a, af, b, &c__1, x, &c__1, r1, r2, w, r__, 
		&info);
	chkxer_("CPPRFS", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 2;
	cpprfs_("U", &c_n1, &c__0, a, af, b, &c__1, x, &c__1, r1, r2, w, r__, 
		&info);
	chkxer_("CPPRFS", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 3;
	cpprfs_("U", &c__0, &c_n1, a, af, b, &c__1, x, &c__1, r1, r2, w, r__, 
		&info);
	chkxer_("CPPRFS", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 7;
	cpprfs_("U", &c__2, &c__1, a, af, b, &c__1, x, &c__2, r1, r2, w, r__, 
		&info);
	chkxer_("CPPRFS", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 9;
	cpprfs_("U", &c__2, &c__1, a, af, b, &c__2, x, &c__1, r1, r2, w, r__, 
		&info);
	chkxer_("CPPRFS", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);

/*        CPPCON */

	s_copy(srnamc_1.srnamt, "CPPCON", (ftnlen)32, (ftnlen)6);
	infoc_1.infot = 1;
	cppcon_("/", &c__0, a, &anrm, &rcond, w, r__, &info);
	chkxer_("CPPCON", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 2;
	cppcon_("U", &c_n1, a, &anrm, &rcond, w, r__, &info);
	chkxer_("CPPCON", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 4;
	r__1 = -anrm;
	cppcon_("U", &c__1, a, &r__1, &rcond, w, r__, &info);
	chkxer_("CPPCON", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);

/*        CPPEQU */

	s_copy(srnamc_1.srnamt, "CPPEQU", (ftnlen)32, (ftnlen)6);
	infoc_1.infot = 1;
	cppequ_("/", &c__0, a, r1, &rcond, &anrm, &info);
	chkxer_("CPPEQU", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 2;
	cppequ_("U", &c_n1, a, r1, &rcond, &anrm, &info);
	chkxer_("CPPEQU", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);

/*     Test error exits of the routines that use the Cholesky */
/*     decomposition of a Hermitian positive definite band matrix. */

    } else if (lsamen_(&c__2, c2, "PB")) {

/*        CPBTRF */

	s_copy(srnamc_1.srnamt, "CPBTRF", (ftnlen)32, (ftnlen)6);
	infoc_1.infot = 1;
	cpbtrf_("/", &c__0, &c__0, a, &c__1, &info);
	chkxer_("CPBTRF", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 2;
	cpbtrf_("U", &c_n1, &c__0, a, &c__1, &info);
	chkxer_("CPBTRF", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 3;
	cpbtrf_("U", &c__1, &c_n1, a, &c__1, &info);
	chkxer_("CPBTRF", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 5;
	cpbtrf_("U", &c__2, &c__1, a, &c__1, &info);
	chkxer_("CPBTRF", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);

/*        CPBTF2 */

	s_copy(srnamc_1.srnamt, "CPBTF2", (ftnlen)32, (ftnlen)6);
	infoc_1.infot = 1;
	cpbtf2_("/", &c__0, &c__0, a, &c__1, &info);
	chkxer_("CPBTF2", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 2;
	cpbtf2_("U", &c_n1, &c__0, a, &c__1, &info);
	chkxer_("CPBTF2", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 3;
	cpbtf2_("U", &c__1, &c_n1, a, &c__1, &info);
	chkxer_("CPBTF2", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 5;
	cpbtf2_("U", &c__2, &c__1, a, &c__1, &info);
	chkxer_("CPBTF2", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);

/*        CPBTRS */

	s_copy(srnamc_1.srnamt, "CPBTRS", (ftnlen)32, (ftnlen)6);
	infoc_1.infot = 1;
	cpbtrs_("/", &c__0, &c__0, &c__0, a, &c__1, b, &c__1, &info);
	chkxer_("CPBTRS", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 2;
	cpbtrs_("U", &c_n1, &c__0, &c__0, a, &c__1, b, &c__1, &info);
	chkxer_("CPBTRS", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 3;
	cpbtrs_("U", &c__1, &c_n1, &c__0, a, &c__1, b, &c__1, &info);
	chkxer_("CPBTRS", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 4;
	cpbtrs_("U", &c__0, &c__0, &c_n1, a, &c__1, b, &c__1, &info);
	chkxer_("CPBTRS", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 6;
	cpbtrs_("U", &c__2, &c__1, &c__1, a, &c__1, b, &c__1, &info);
	chkxer_("CPBTRS", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 8;
	cpbtrs_("U", &c__2, &c__0, &c__1, a, &c__1, b, &c__1, &info);
	chkxer_("CPBTRS", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);

/*        CPBRFS */

	s_copy(srnamc_1.srnamt, "CPBRFS", (ftnlen)32, (ftnlen)6);
	infoc_1.infot = 1;
	cpbrfs_("/", &c__0, &c__0, &c__0, a, &c__1, af, &c__1, b, &c__1, x, &
		c__1, r1, r2, w, r__, &info);
	chkxer_("CPBRFS", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 2;
	cpbrfs_("U", &c_n1, &c__0, &c__0, a, &c__1, af, &c__1, b, &c__1, x, &
		c__1, r1, r2, w, r__, &info);
	chkxer_("CPBRFS", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 3;
	cpbrfs_("U", &c__1, &c_n1, &c__0, a, &c__1, af, &c__1, b, &c__1, x, &
		c__1, r1, r2, w, r__, &info);
	chkxer_("CPBRFS", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 4;
	cpbrfs_("U", &c__0, &c__0, &c_n1, a, &c__1, af, &c__1, b, &c__1, x, &
		c__1, r1, r2, w, r__, &info);
	chkxer_("CPBRFS", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 6;
	cpbrfs_("U", &c__2, &c__1, &c__1, a, &c__1, af, &c__2, b, &c__2, x, &
		c__2, r1, r2, w, r__, &info);
	chkxer_("CPBRFS", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 8;
	cpbrfs_("U", &c__2, &c__1, &c__1, a, &c__2, af, &c__1, b, &c__2, x, &
		c__2, r1, r2, w, r__, &info);
	chkxer_("CPBRFS", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 10;
	cpbrfs_("U", &c__2, &c__0, &c__1, a, &c__1, af, &c__1, b, &c__1, x, &
		c__2, r1, r2, w, r__, &info);
	chkxer_("CPBRFS", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 12;
	cpbrfs_("U", &c__2, &c__0, &c__1, a, &c__1, af, &c__1, b, &c__2, x, &
		c__1, r1, r2, w, r__, &info);
	chkxer_("CPBRFS", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);

/*        CPBCON */

	s_copy(srnamc_1.srnamt, "CPBCON", (ftnlen)32, (ftnlen)6);
	infoc_1.infot = 1;
	cpbcon_("/", &c__0, &c__0, a, &c__1, &anrm, &rcond, w, r__, &info);
	chkxer_("CPBCON", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 2;
	cpbcon_("U", &c_n1, &c__0, a, &c__1, &anrm, &rcond, w, r__, &info);
	chkxer_("CPBCON", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 3;
	cpbcon_("U", &c__1, &c_n1, a, &c__1, &anrm, &rcond, w, r__, &info);
	chkxer_("CPBCON", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 5;
	cpbcon_("U", &c__2, &c__1, a, &c__1, &anrm, &rcond, w, r__, &info);
	chkxer_("CPBCON", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 6;
	r__1 = -anrm;
	cpbcon_("U", &c__1, &c__0, a, &c__1, &r__1, &rcond, w, r__, &info);
	chkxer_("CPBCON", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);

/*        CPBEQU */

	s_copy(srnamc_1.srnamt, "CPBEQU", (ftnlen)32, (ftnlen)6);
	infoc_1.infot = 1;
	cpbequ_("/", &c__0, &c__0, a, &c__1, r1, &rcond, &anrm, &info);
	chkxer_("CPBEQU", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 2;
	cpbequ_("U", &c_n1, &c__0, a, &c__1, r1, &rcond, &anrm, &info);
	chkxer_("CPBEQU", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 3;
	cpbequ_("U", &c__1, &c_n1, a, &c__1, r1, &rcond, &anrm, &info);
	chkxer_("CPBEQU", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
	infoc_1.infot = 5;
	cpbequ_("U", &c__2, &c__1, a, &c__1, r1, &rcond, &anrm, &info);
	chkxer_("CPBEQU", &infoc_1.infot, &infoc_1.nout, &infoc_1.lerr, &
		infoc_1.ok);
    }

/*     Print a summary line. */

    alaesm_(path, &infoc_1.ok, &infoc_1.nout);

    return 0;

/*     End of CERRPO */

} /* cerrpo_ */
Ejemplo n.º 2
0
/* Subroutine */ int cchkpb_(logical *dotype, integer *nn, integer *nval, 
	integer *nnb, integer *nbval, integer *nns, integer *nsval, real *
	thresh, logical *tsterr, integer *nmax, complex *a, complex *afac, 
	complex *ainv, complex *b, complex *x, complex *xact, complex *work, 
	real *rwork, integer *nout)
{
    /* Initialized data */

    static integer iseedy[4] = { 1988,1989,1990,1991 };

    /* Format strings */
    static char fmt_9999[] = "(\002 UPLO='\002,a1,\002', N=\002,i5,\002, KD"
	    "=\002,i5,\002, NB=\002,i4,\002, type \002,i2,\002, test \002,i2"
	    ",\002, ratio= \002,g12.5)";
    static char fmt_9998[] = "(\002 UPLO='\002,a1,\002', N=\002,i5,\002, KD"
	    "=\002,i5,\002, NRHS=\002,i3,\002, type \002,i2,\002, test(\002,i"
	    "2,\002) = \002,g12.5)";
    static char fmt_9997[] = "(\002 UPLO='\002,a1,\002', N=\002,i5,\002, KD"
	    "=\002,i5,\002,\002,10x,\002 type \002,i2,\002, test(\002,i2,\002"
	    ") = \002,g12.5)";

    /* System generated locals */
    integer i__1, i__2, i__3, i__4, i__5, i__6;

    /* Local variables */
    integer i__, k, n, i1, i2, kd, nb, in, kl, iw, ku, lda, ikd, inb, nkd, 
	    ldab, ioff, mode, koff, imat, info;
    char path[3], dist[1];
    integer irhs, nrhs;
    char uplo[1], type__[1];
    integer nrun;
    integer nfail, iseed[4];
    integer kdval[4];
    real rcond;
    integer nimat;
    real anorm;
    integer iuplo, izero, nerrs;
    logical zerot;
    char xtype[1];
    real rcondc;
    char packit[1];
    real cndnum;
    real ainvnm;
    real result[7];

    /* Fortran I/O blocks */
    static cilist io___40 = { 0, 0, 0, fmt_9999, 0 };
    static cilist io___46 = { 0, 0, 0, fmt_9998, 0 };
    static cilist io___48 = { 0, 0, 0, fmt_9997, 0 };



/*  -- LAPACK test routine (version 3.1) -- */
/*     Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd.. */
/*     November 2006 */

/*     .. Scalar Arguments .. */
/*     .. */
/*     .. Array Arguments .. */
/*     .. */

/*  Purpose */
/*  ======= */

/*  CCHKPB tests CPBTRF, -TRS, -RFS, and -CON. */

/*  Arguments */
/*  ========= */

/*  DOTYPE  (input) LOGICAL array, dimension (NTYPES) */
/*          The matrix types to be used for testing.  Matrices of type j */
/*          (for 1 <= j <= NTYPES) are used for testing if DOTYPE(j) = */
/*          .TRUE.; if DOTYPE(j) = .FALSE., then type j is not used. */

/*  NN      (input) INTEGER */
/*          The number of values of N contained in the vector NVAL. */

/*  NVAL    (input) INTEGER array, dimension (NN) */
/*          The values of the matrix dimension N. */

/*  NNB     (input) INTEGER */
/*          The number of values of NB contained in the vector NBVAL. */

/*  NBVAL   (input) INTEGER array, dimension (NBVAL) */
/*          The values of the blocksize NB. */

/*  NNS     (input) INTEGER */
/*          The number of values of NRHS contained in the vector NSVAL. */

/*  NSVAL   (input) INTEGER array, dimension (NNS) */
/*          The values of the number of right hand sides NRHS. */

/*  THRESH  (input) REAL */
/*          The threshold value for the test ratios.  A result is */
/*          included in the output file if RESULT >= THRESH.  To have */
/*          every test ratio printed, use THRESH = 0. */

/*  TSTERR  (input) LOGICAL */
/*          Flag that indicates whether error exits are to be tested. */

/*  NMAX    (input) INTEGER */
/*          The maximum value permitted for N, used in dimensioning the */
/*          work arrays. */

/*  A       (workspace) REAL array, dimension (NMAX*NMAX) */

/*  AFAC    (workspace) REAL array, dimension (NMAX*NMAX) */

/*  AINV    (workspace) REAL array, dimension (NMAX*NMAX) */

/*  B       (workspace) REAL array, dimension (NMAX*NSMAX) */
/*          where NSMAX is the largest entry in NSVAL. */

/*  X       (workspace) REAL array, dimension (NMAX*NSMAX) */

/*  XACT    (workspace) REAL array, dimension (NMAX*NSMAX) */

/*  WORK    (workspace) REAL array, dimension */
/*                      (NMAX*max(3,NSMAX)) */

/*  RWORK   (workspace) REAL array, dimension */
/*                      (max(NMAX,2*NSMAX)) */

/*  NOUT    (input) INTEGER */
/*          The unit number for output. */

/*  ===================================================================== */

/*     .. Parameters .. */
/*     .. */
/*     .. Local Scalars .. */
/*     .. */
/*     .. Local Arrays .. */
/*     .. */
/*     .. External Functions .. */
/*     .. */
/*     .. External Subroutines .. */
/*     .. */
/*     .. Intrinsic Functions .. */
/*     .. */
/*     .. Scalars in Common .. */
/*     .. */
/*     .. Common blocks .. */
/*     .. */
/*     .. Data statements .. */
    /* Parameter adjustments */
    --rwork;
    --work;
    --xact;
    --x;
    --b;
    --ainv;
    --afac;
    --a;
    --nsval;
    --nbval;
    --nval;
    --dotype;

    /* Function Body */
/*     .. */
/*     .. Executable Statements .. */

/*     Initialize constants and the random number seed. */

    s_copy(path, "Complex precision", (ftnlen)1, (ftnlen)17);
    s_copy(path + 1, "PB", (ftnlen)2, (ftnlen)2);
    nrun = 0;
    nfail = 0;
    nerrs = 0;
    for (i__ = 1; i__ <= 4; ++i__) {
	iseed[i__ - 1] = iseedy[i__ - 1];
/* L10: */
    }

/*     Test the error exits */

    if (*tsterr) {
	cerrpo_(path, nout);
    }
    infoc_1.infot = 0;
    kdval[0] = 0;

/*     Do for each value of N in NVAL */

    i__1 = *nn;
    for (in = 1; in <= i__1; ++in) {
	n = nval[in];
	lda = max(n,1);
	*(unsigned char *)xtype = 'N';

/*        Set limits on the number of loop iterations. */

/* Computing MAX */
	i__2 = 1, i__3 = min(n,4);
	nkd = max(i__2,i__3);
	nimat = 8;
	if (n == 0) {
	    nimat = 1;
	}

	kdval[1] = n + (n + 1) / 4;
	kdval[2] = (n * 3 - 1) / 4;
	kdval[3] = (n + 1) / 4;

	i__2 = nkd;
	for (ikd = 1; ikd <= i__2; ++ikd) {

/*           Do for KD = 0, (5*N+1)/4, (3N-1)/4, and (N+1)/4. This order */
/*           makes it easier to skip redundant values for small values */
/*           of N. */

	    kd = kdval[ikd - 1];
	    ldab = kd + 1;

/*           Do first for UPLO = 'U', then for UPLO = 'L' */

	    for (iuplo = 1; iuplo <= 2; ++iuplo) {
		koff = 1;
		if (iuplo == 1) {
		    *(unsigned char *)uplo = 'U';
/* Computing MAX */
		    i__3 = 1, i__4 = kd + 2 - n;
		    koff = max(i__3,i__4);
		    *(unsigned char *)packit = 'Q';
		} else {
		    *(unsigned char *)uplo = 'L';
		    *(unsigned char *)packit = 'B';
		}

		i__3 = nimat;
		for (imat = 1; imat <= i__3; ++imat) {

/*                 Do the tests only if DOTYPE( IMAT ) is true. */

		    if (! dotype[imat]) {
			goto L60;
		    }

/*                 Skip types 2, 3, or 4 if the matrix size is too small. */

		    zerot = imat >= 2 && imat <= 4;
		    if (zerot && n < imat - 1) {
			goto L60;
		    }

		    if (! zerot || ! dotype[1]) {

/*                    Set up parameters with CLATB4 and generate a test */
/*                    matrix with CLATMS. */

			clatb4_(path, &imat, &n, &n, type__, &kl, &ku, &anorm, 
				 &mode, &cndnum, dist);

			s_copy(srnamc_1.srnamt, "CLATMS", (ftnlen)32, (ftnlen)
				6);
			clatms_(&n, &n, dist, iseed, type__, &rwork[1], &mode, 
				 &cndnum, &anorm, &kd, &kd, packit, &a[koff], 
				&ldab, &work[1], &info);

/*                    Check error code from CLATMS. */

			if (info != 0) {
			    alaerh_(path, "CLATMS", &info, &c__0, uplo, &n, &
				    n, &kd, &kd, &c_n1, &imat, &nfail, &nerrs, 
				     nout);
			    goto L60;
			}
		    } else if (izero > 0) {

/*                    Use the same matrix for types 3 and 4 as for type */
/*                    2 by copying back the zeroed out column, */

			iw = (lda << 1) + 1;
			if (iuplo == 1) {
			    ioff = (izero - 1) * ldab + kd + 1;
			    i__4 = izero - i1;
			    ccopy_(&i__4, &work[iw], &c__1, &a[ioff - izero + 
				    i1], &c__1);
			    iw = iw + izero - i1;
			    i__4 = i2 - izero + 1;
/* Computing MAX */
			    i__6 = ldab - 1;
			    i__5 = max(i__6,1);
			    ccopy_(&i__4, &work[iw], &c__1, &a[ioff], &i__5);
			} else {
			    ioff = (i1 - 1) * ldab + 1;
			    i__4 = izero - i1;
/* Computing MAX */
			    i__6 = ldab - 1;
			    i__5 = max(i__6,1);
			    ccopy_(&i__4, &work[iw], &c__1, &a[ioff + izero - 
				    i1], &i__5);
			    ioff = (izero - 1) * ldab + 1;
			    iw = iw + izero - i1;
			    i__4 = i2 - izero + 1;
			    ccopy_(&i__4, &work[iw], &c__1, &a[ioff], &c__1);
			}
		    }

/*                 For types 2-4, zero one row and column of the matrix */
/*                 to test that INFO is returned correctly. */

		    izero = 0;
		    if (zerot) {
			if (imat == 2) {
			    izero = 1;
			} else if (imat == 3) {
			    izero = n;
			} else {
			    izero = n / 2 + 1;
			}

/*                    Save the zeroed out row and column in WORK(*,3) */

			iw = lda << 1;
/* Computing MIN */
			i__5 = (kd << 1) + 1;
			i__4 = min(i__5,n);
			for (i__ = 1; i__ <= i__4; ++i__) {
			    i__5 = iw + i__;
			    work[i__5].r = 0.f, work[i__5].i = 0.f;
/* L20: */
			}
			++iw;
/* Computing MAX */
			i__4 = izero - kd;
			i1 = max(i__4,1);
/* Computing MIN */
			i__4 = izero + kd;
			i2 = min(i__4,n);

			if (iuplo == 1) {
			    ioff = (izero - 1) * ldab + kd + 1;
			    i__4 = izero - i1;
			    cswap_(&i__4, &a[ioff - izero + i1], &c__1, &work[
				    iw], &c__1);
			    iw = iw + izero - i1;
			    i__4 = i2 - izero + 1;
/* Computing MAX */
			    i__6 = ldab - 1;
			    i__5 = max(i__6,1);
			    cswap_(&i__4, &a[ioff], &i__5, &work[iw], &c__1);
			} else {
			    ioff = (i1 - 1) * ldab + 1;
			    i__4 = izero - i1;
/* Computing MAX */
			    i__6 = ldab - 1;
			    i__5 = max(i__6,1);
			    cswap_(&i__4, &a[ioff + izero - i1], &i__5, &work[
				    iw], &c__1);
			    ioff = (izero - 1) * ldab + 1;
			    iw = iw + izero - i1;
			    i__4 = i2 - izero + 1;
			    cswap_(&i__4, &a[ioff], &c__1, &work[iw], &c__1);
			}
		    }

/*                 Set the imaginary part of the diagonals. */

		    if (iuplo == 1) {
			claipd_(&n, &a[kd + 1], &ldab, &c__0);
		    } else {
			claipd_(&n, &a[1], &ldab, &c__0);
		    }

/*                 Do for each value of NB in NBVAL */

		    i__4 = *nnb;
		    for (inb = 1; inb <= i__4; ++inb) {
			nb = nbval[inb];
			xlaenv_(&c__1, &nb);

/*                    Compute the L*L' or U'*U factorization of the band */
/*                    matrix. */

			i__5 = kd + 1;
			clacpy_("Full", &i__5, &n, &a[1], &ldab, &afac[1], &
				ldab);
			s_copy(srnamc_1.srnamt, "CPBTRF", (ftnlen)32, (ftnlen)
				6);
			cpbtrf_(uplo, &n, &kd, &afac[1], &ldab, &info);

/*                    Check error code from CPBTRF. */

			if (info != izero) {
			    alaerh_(path, "CPBTRF", &info, &izero, uplo, &n, &
				    n, &kd, &kd, &nb, &imat, &nfail, &nerrs, 
				    nout);
			    goto L50;
			}

/*                    Skip the tests if INFO is not 0. */

			if (info != 0) {
			    goto L50;
			}

/* +    TEST 1 */
/*                    Reconstruct matrix from factors and compute */
/*                    residual. */

			i__5 = kd + 1;
			clacpy_("Full", &i__5, &n, &afac[1], &ldab, &ainv[1], 
				&ldab);
			cpbt01_(uplo, &n, &kd, &a[1], &ldab, &ainv[1], &ldab, 
				&rwork[1], result);

/*                    Print the test ratio if it is .GE. THRESH. */

			if (result[0] >= *thresh) {
			    if (nfail == 0 && nerrs == 0) {
				alahd_(nout, path);
			    }
			    io___40.ciunit = *nout;
			    s_wsfe(&io___40);
			    do_fio(&c__1, uplo, (ftnlen)1);
			    do_fio(&c__1, (char *)&n, (ftnlen)sizeof(integer))
				    ;
			    do_fio(&c__1, (char *)&kd, (ftnlen)sizeof(integer)
				    );
			    do_fio(&c__1, (char *)&nb, (ftnlen)sizeof(integer)
				    );
			    do_fio(&c__1, (char *)&imat, (ftnlen)sizeof(
				    integer));
			    do_fio(&c__1, (char *)&c__1, (ftnlen)sizeof(
				    integer));
			    do_fio(&c__1, (char *)&result[0], (ftnlen)sizeof(
				    real));
			    e_wsfe();
			    ++nfail;
			}
			++nrun;

/*                    Only do other tests if this is the first blocksize. */

			if (inb > 1) {
			    goto L50;
			}

/*                    Form the inverse of A so we can get a good estimate */
/*                    of RCONDC = 1/(norm(A) * norm(inv(A))). */

			claset_("Full", &n, &n, &c_b50, &c_b51, &ainv[1], &
				lda);
			s_copy(srnamc_1.srnamt, "CPBTRS", (ftnlen)32, (ftnlen)
				6);
			cpbtrs_(uplo, &n, &kd, &n, &afac[1], &ldab, &ainv[1], 
				&lda, &info);

/*                    Compute RCONDC = 1/(norm(A) * norm(inv(A))). */

			anorm = clanhb_("1", uplo, &n, &kd, &a[1], &ldab, &
				rwork[1]);
			ainvnm = clange_("1", &n, &n, &ainv[1], &lda, &rwork[
				1]);
			if (anorm <= 0.f || ainvnm <= 0.f) {
			    rcondc = 1.f;
			} else {
			    rcondc = 1.f / anorm / ainvnm;
			}

			i__5 = *nns;
			for (irhs = 1; irhs <= i__5; ++irhs) {
			    nrhs = nsval[irhs];

/* +    TEST 2 */
/*                    Solve and compute residual for A * X = B. */

			    s_copy(srnamc_1.srnamt, "CLARHS", (ftnlen)32, (
				    ftnlen)6);
			    clarhs_(path, xtype, uplo, " ", &n, &n, &kd, &kd, 
				    &nrhs, &a[1], &ldab, &xact[1], &lda, &b[1]
, &lda, iseed, &info);
			    clacpy_("Full", &n, &nrhs, &b[1], &lda, &x[1], &
				    lda);

			    s_copy(srnamc_1.srnamt, "CPBTRS", (ftnlen)32, (
				    ftnlen)6);
			    cpbtrs_(uplo, &n, &kd, &nrhs, &afac[1], &ldab, &x[
				    1], &lda, &info);

/*                    Check error code from CPBTRS. */

			    if (info != 0) {
				alaerh_(path, "CPBTRS", &info, &c__0, uplo, &
					n, &n, &kd, &kd, &nrhs, &imat, &nfail, 
					 &nerrs, nout);
			    }

			    clacpy_("Full", &n, &nrhs, &b[1], &lda, &work[1], 
				    &lda);
			    cpbt02_(uplo, &n, &kd, &nrhs, &a[1], &ldab, &x[1], 
				     &lda, &work[1], &lda, &rwork[1], &result[
				    1]);

/* +    TEST 3 */
/*                    Check solution from generated exact solution. */

			    cget04_(&n, &nrhs, &x[1], &lda, &xact[1], &lda, &
				    rcondc, &result[2]);

/* +    TESTS 4, 5, and 6 */
/*                    Use iterative refinement to improve the solution. */

			    s_copy(srnamc_1.srnamt, "CPBRFS", (ftnlen)32, (
				    ftnlen)6);
			    cpbrfs_(uplo, &n, &kd, &nrhs, &a[1], &ldab, &afac[
				    1], &ldab, &b[1], &lda, &x[1], &lda, &
				    rwork[1], &rwork[nrhs + 1], &work[1], &
				    rwork[(nrhs << 1) + 1], &info);

/*                    Check error code from CPBRFS. */

			    if (info != 0) {
				alaerh_(path, "CPBRFS", &info, &c__0, uplo, &
					n, &n, &kd, &kd, &nrhs, &imat, &nfail, 
					 &nerrs, nout);
			    }

			    cget04_(&n, &nrhs, &x[1], &lda, &xact[1], &lda, &
				    rcondc, &result[3]);
			    cpbt05_(uplo, &n, &kd, &nrhs, &a[1], &ldab, &b[1], 
				     &lda, &x[1], &lda, &xact[1], &lda, &
				    rwork[1], &rwork[nrhs + 1], &result[4]);

/*                       Print information about the tests that did not */
/*                       pass the threshold. */

			    for (k = 2; k <= 6; ++k) {
				if (result[k - 1] >= *thresh) {
				    if (nfail == 0 && nerrs == 0) {
					alahd_(nout, path);
				    }
				    io___46.ciunit = *nout;
				    s_wsfe(&io___46);
				    do_fio(&c__1, uplo, (ftnlen)1);
				    do_fio(&c__1, (char *)&n, (ftnlen)sizeof(
					    integer));
				    do_fio(&c__1, (char *)&kd, (ftnlen)sizeof(
					    integer));
				    do_fio(&c__1, (char *)&nrhs, (ftnlen)
					    sizeof(integer));
				    do_fio(&c__1, (char *)&imat, (ftnlen)
					    sizeof(integer));
				    do_fio(&c__1, (char *)&k, (ftnlen)sizeof(
					    integer));
				    do_fio(&c__1, (char *)&result[k - 1], (
					    ftnlen)sizeof(real));
				    e_wsfe();
				    ++nfail;
				}
/* L30: */
			    }
			    nrun += 5;
/* L40: */
			}

/* +    TEST 7 */
/*                    Get an estimate of RCOND = 1/CNDNUM. */

			s_copy(srnamc_1.srnamt, "CPBCON", (ftnlen)32, (ftnlen)
				6);
			cpbcon_(uplo, &n, &kd, &afac[1], &ldab, &anorm, &
				rcond, &work[1], &rwork[1], &info);

/*                    Check error code from CPBCON. */

			if (info != 0) {
			    alaerh_(path, "CPBCON", &info, &c__0, uplo, &n, &
				    n, &kd, &kd, &c_n1, &imat, &nfail, &nerrs, 
				     nout);
			}

			result[6] = sget06_(&rcond, &rcondc);

/*                    Print the test ratio if it is .GE. THRESH. */

			if (result[6] >= *thresh) {
			    if (nfail == 0 && nerrs == 0) {
				alahd_(nout, path);
			    }
			    io___48.ciunit = *nout;
			    s_wsfe(&io___48);
			    do_fio(&c__1, uplo, (ftnlen)1);
			    do_fio(&c__1, (char *)&n, (ftnlen)sizeof(integer))
				    ;
			    do_fio(&c__1, (char *)&kd, (ftnlen)sizeof(integer)
				    );
			    do_fio(&c__1, (char *)&imat, (ftnlen)sizeof(
				    integer));
			    do_fio(&c__1, (char *)&c__7, (ftnlen)sizeof(
				    integer));
			    do_fio(&c__1, (char *)&result[6], (ftnlen)sizeof(
				    real));
			    e_wsfe();
			    ++nfail;
			}
			++nrun;
L50:
			;
		    }
L60:
		    ;
		}
/* L70: */
	    }
/* L80: */
	}
/* L90: */
    }

/*     Print a summary of the results. */

    alasum_(path, nout, &nfail, &nrun, &nerrs);

    return 0;

/*     End of CCHKPB */

} /* cchkpb_ */
Ejemplo n.º 3
0
/* Subroutine */
int cpbsvx_(char *fact, char *uplo, integer *n, integer *kd, integer *nrhs, complex *ab, integer *ldab, complex *afb, integer * ldafb, char *equed, real *s, complex *b, integer *ldb, complex *x, integer *ldx, real *rcond, real *ferr, real *berr, complex *work, real *rwork, integer *info)
{
    /* System generated locals */
    integer ab_dim1, ab_offset, afb_dim1, afb_offset, b_dim1, b_offset, x_dim1, x_offset, i__1, i__2, i__3, i__4, i__5;
    real r__1, r__2;
    complex q__1;
    /* Local variables */
    integer i__, j, j1, j2;
    real amax, smin, smax;
    extern logical lsame_(char *, char *);
    real scond, anorm;
    extern /* Subroutine */
    int ccopy_(integer *, complex *, integer *, complex *, integer *);
    logical equil, rcequ, upper;
    extern real clanhb_(char *, char *, integer *, integer *, complex *, integer *, real *);
    extern /* Subroutine */
    int claqhb_(char *, integer *, integer *, complex *, integer *, real *, real *, real *, char *), cpbcon_(char *, integer *, integer *, complex *, integer *, real * , real *, complex *, real *, integer *);
    extern real slamch_(char *);
    logical nofact;
    extern /* Subroutine */
    int clacpy_(char *, integer *, integer *, complex *, integer *, complex *, integer *), xerbla_(char *, integer *), cpbequ_(char *, integer *, integer *, complex *, integer *, real *, real *, real *, integer *), cpbrfs_( char *, integer *, integer *, integer *, complex *, integer *, complex *, integer *, complex *, integer *, complex *, integer *, real *, real *, complex *, real *, integer *);
    real bignum;
    extern /* Subroutine */
    int cpbtrf_(char *, integer *, integer *, complex *, integer *, integer *);
    integer infequ;
    extern /* Subroutine */
    int cpbtrs_(char *, integer *, integer *, integer *, complex *, integer *, complex *, integer *, integer *);
    real smlnum;
    /* -- LAPACK driver routine (version 3.4.1) -- */
    /* -- LAPACK is a software package provided by Univ. of Tennessee, -- */
    /* -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..-- */
    /* April 2012 */
    /* .. Scalar Arguments .. */
    /* .. */
    /* .. Array Arguments .. */
    /* .. */
    /* ===================================================================== */
    /* .. Parameters .. */
    /* .. */
    /* .. Local Scalars .. */
    /* .. */
    /* .. External Functions .. */
    /* .. */
    /* .. External Subroutines .. */
    /* .. */
    /* .. Intrinsic Functions .. */
    /* .. */
    /* .. Executable Statements .. */
    /* Parameter adjustments */
    ab_dim1 = *ldab;
    ab_offset = 1 + ab_dim1;
    ab -= ab_offset;
    afb_dim1 = *ldafb;
    afb_offset = 1 + afb_dim1;
    afb -= afb_offset;
    --s;
    b_dim1 = *ldb;
    b_offset = 1 + b_dim1;
    b -= b_offset;
    x_dim1 = *ldx;
    x_offset = 1 + x_dim1;
    x -= x_offset;
    --ferr;
    --berr;
    --work;
    --rwork;
    /* Function Body */
    *info = 0;
    nofact = lsame_(fact, "N");
    equil = lsame_(fact, "E");
    upper = lsame_(uplo, "U");
    if (nofact || equil)
    {
        *(unsigned char *)equed = 'N';
        rcequ = FALSE_;
    }
    else
    {
        rcequ = lsame_(equed, "Y");
        smlnum = slamch_("Safe minimum");
        bignum = 1.f / smlnum;
    }
    /* Test the input parameters. */
    if (! nofact && ! equil && ! lsame_(fact, "F"))
    {
        *info = -1;
    }
    else if (! upper && ! lsame_(uplo, "L"))
    {
        *info = -2;
    }
    else if (*n < 0)
    {
        *info = -3;
    }
    else if (*kd < 0)
    {
        *info = -4;
    }
    else if (*nrhs < 0)
    {
        *info = -5;
    }
    else if (*ldab < *kd + 1)
    {
        *info = -7;
    }
    else if (*ldafb < *kd + 1)
    {
        *info = -9;
    }
    else if (lsame_(fact, "F") && ! (rcequ || lsame_( equed, "N")))
    {
        *info = -10;
    }
    else
    {
        if (rcequ)
        {
            smin = bignum;
            smax = 0.f;
            i__1 = *n;
            for (j = 1;
                    j <= i__1;
                    ++j)
            {
                /* Computing MIN */
                r__1 = smin;
                r__2 = s[j]; // , expr subst
                smin = min(r__1,r__2);
                /* Computing MAX */
                r__1 = smax;
                r__2 = s[j]; // , expr subst
                smax = max(r__1,r__2);
                /* L10: */
            }
            if (smin <= 0.f)
            {
                *info = -11;
            }
            else if (*n > 0)
            {
                scond = max(smin,smlnum) / min(smax,bignum);
            }
            else
            {
                scond = 1.f;
            }
        }
        if (*info == 0)
        {
            if (*ldb < max(1,*n))
            {
                *info = -13;
            }
            else if (*ldx < max(1,*n))
            {
                *info = -15;
            }
        }
    }
    if (*info != 0)
    {
        i__1 = -(*info);
        xerbla_("CPBSVX", &i__1);
        return 0;
    }
    if (equil)
    {
        /* Compute row and column scalings to equilibrate the matrix A. */
        cpbequ_(uplo, n, kd, &ab[ab_offset], ldab, &s[1], &scond, &amax, & infequ);
        if (infequ == 0)
        {
            /* Equilibrate the matrix. */
            claqhb_(uplo, n, kd, &ab[ab_offset], ldab, &s[1], &scond, &amax, equed);
            rcequ = lsame_(equed, "Y");
        }
    }
    /* Scale the right-hand side. */
    if (rcequ)
    {
        i__1 = *nrhs;
        for (j = 1;
                j <= i__1;
                ++j)
        {
            i__2 = *n;
            for (i__ = 1;
                    i__ <= i__2;
                    ++i__)
            {
                i__3 = i__ + j * b_dim1;
                i__4 = i__;
                i__5 = i__ + j * b_dim1;
                q__1.r = s[i__4] * b[i__5].r;
                q__1.i = s[i__4] * b[i__5].i; // , expr subst
                b[i__3].r = q__1.r;
                b[i__3].i = q__1.i; // , expr subst
                /* L20: */
            }
            /* L30: */
        }
    }
    if (nofact || equil)
    {
        /* Compute the Cholesky factorization A = U**H *U or A = L*L**H. */
        if (upper)
        {
            i__1 = *n;
            for (j = 1;
                    j <= i__1;
                    ++j)
            {
                /* Computing MAX */
                i__2 = j - *kd;
                j1 = max(i__2,1);
                i__2 = j - j1 + 1;
                ccopy_(&i__2, &ab[*kd + 1 - j + j1 + j * ab_dim1], &c__1, & afb[*kd + 1 - j + j1 + j * afb_dim1], &c__1);
                /* L40: */
            }
        }
        else
        {
            i__1 = *n;
            for (j = 1;
                    j <= i__1;
                    ++j)
            {
                /* Computing MIN */
                i__2 = j + *kd;
                j2 = min(i__2,*n);
                i__2 = j2 - j + 1;
                ccopy_(&i__2, &ab[j * ab_dim1 + 1], &c__1, &afb[j * afb_dim1 + 1], &c__1);
                /* L50: */
            }
        }
        cpbtrf_(uplo, n, kd, &afb[afb_offset], ldafb, info);
        /* Return if INFO is non-zero. */
        if (*info > 0)
        {
            *rcond = 0.f;
            return 0;
        }
    }
    /* Compute the norm of the matrix A. */
    anorm = clanhb_("1", uplo, n, kd, &ab[ab_offset], ldab, &rwork[1]);
    /* Compute the reciprocal of the condition number of A. */
    cpbcon_(uplo, n, kd, &afb[afb_offset], ldafb, &anorm, rcond, &work[1], & rwork[1], info);
    /* Compute the solution matrix X. */
    clacpy_("Full", n, nrhs, &b[b_offset], ldb, &x[x_offset], ldx);
    cpbtrs_(uplo, n, kd, nrhs, &afb[afb_offset], ldafb, &x[x_offset], ldx, info);
    /* Use iterative refinement to improve the computed solution and */
    /* compute error bounds and backward error estimates for it. */
    cpbrfs_(uplo, n, kd, nrhs, &ab[ab_offset], ldab, &afb[afb_offset], ldafb, &b[b_offset], ldb, &x[x_offset], ldx, &ferr[1], &berr[1], &work[1] , &rwork[1], info);
    /* Transform the solution matrix X to a solution of the original */
    /* system. */
    if (rcequ)
    {
        i__1 = *nrhs;
        for (j = 1;
                j <= i__1;
                ++j)
        {
            i__2 = *n;
            for (i__ = 1;
                    i__ <= i__2;
                    ++i__)
            {
                i__3 = i__ + j * x_dim1;
                i__4 = i__;
                i__5 = i__ + j * x_dim1;
                q__1.r = s[i__4] * x[i__5].r;
                q__1.i = s[i__4] * x[i__5].i; // , expr subst
                x[i__3].r = q__1.r;
                x[i__3].i = q__1.i; // , expr subst
                /* L60: */
            }
            /* L70: */
        }
        i__1 = *nrhs;
        for (j = 1;
                j <= i__1;
                ++j)
        {
            ferr[j] /= scond;
            /* L80: */
        }
    }
    /* Set INFO = N+1 if the matrix is singular to working precision. */
    if (*rcond < slamch_("Epsilon"))
    {
        *info = *n + 1;
    }
    return 0;
    /* End of CPBSVX */
}
Ejemplo n.º 4
0
 int cpbsvx_(char *fact, char *uplo, int *n, int *kd, 
	int *nrhs, complex *ab, int *ldab, complex *afb, int *
	ldafb, char *equed, float *s, complex *b, int *ldb, complex *x, 
	int *ldx, float *rcond, float *ferr, float *berr, complex *work, 
	float *rwork, int *info)
{
    /* System generated locals */
    int ab_dim1, ab_offset, afb_dim1, afb_offset, b_dim1, b_offset, 
	    x_dim1, x_offset, i__1, i__2, i__3, i__4, i__5;
    float r__1, r__2;
    complex q__1;

    /* Local variables */
    int i__, j, j1, j2;
    float amax, smin, smax;
    extern int lsame_(char *, char *);
    float scond, anorm;
    extern  int ccopy_(int *, complex *, int *, 
	    complex *, int *);
    int equil, rcequ, upper;
    extern double clanhb_(char *, char *, int *, int *, complex *, 
	     int *, float *);
    extern  int claqhb_(char *, int *, int *, complex 
	    *, int *, float *, float *, float *, char *), 
	    cpbcon_(char *, int *, int *, complex *, int *, float *
, float *, complex *, float *, int *);
    extern double slamch_(char *);
    int nofact;
    extern  int clacpy_(char *, int *, int *, complex 
	    *, int *, complex *, int *), xerbla_(char *, 
	    int *), cpbequ_(char *, int *, int *, complex 
	    *, int *, float *, float *, float *, int *), cpbrfs_(
	    char *, int *, int *, int *, complex *, int *, 
	    complex *, int *, complex *, int *, complex *, int *, 
	    float *, float *, complex *, float *, int *);
    float bignum;
    extern  int cpbtrf_(char *, int *, int *, complex 
	    *, int *, int *);
    int infequ;
    extern  int cpbtrs_(char *, int *, int *, int 
	    *, complex *, int *, complex *, int *, int *);
    float smlnum;


/*  -- LAPACK driver routine (version 3.2) -- */
/*     Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd.. */
/*     November 2006 */

/*     .. Scalar Arguments .. */
/*     .. */
/*     .. Array Arguments .. */
/*     .. */

/*  Purpose */
/*  ======= */

/*  CPBSVX uses the Cholesky factorization A = U**H*U or A = L*L**H to */
/*  compute the solution to a complex system of linear equations */
/*     A * X = B, */
/*  where A is an N-by-N Hermitian positive definite band matrix and X */
/*  and B are N-by-NRHS matrices. */

/*  Error bounds on the solution and a condition estimate are also */
/*  provided. */

/*  Description */
/*  =========== */

/*  The following steps are performed: */

/*  1. If FACT = 'E', float scaling factors are computed to equilibrate */
/*     the system: */
/*        diag(S) * A * diag(S) * inv(diag(S)) * X = diag(S) * B */
/*     Whether or not the system will be equilibrated depends on the */
/*     scaling of the matrix A, but if equilibration is used, A is */
/*     overwritten by diag(S)*A*diag(S) and B by diag(S)*B. */

/*  2. If FACT = 'N' or 'E', the Cholesky decomposition is used to */
/*     factor the matrix A (after equilibration if FACT = 'E') as */
/*        A = U**H * U,  if UPLO = 'U', or */
/*        A = L * L**H,  if UPLO = 'L', */
/*     where U is an upper triangular band matrix, and L is a lower */
/*     triangular band matrix. */

/*  3. If the leading i-by-i principal minor is not positive definite, */
/*     then the routine returns with INFO = i. Otherwise, the factored */
/*     form of A is used to estimate the condition number of the matrix */
/*     A.  If the reciprocal of the condition number is less than machine */
/*     precision, INFO = N+1 is returned as a warning, but the routine */
/*     still goes on to solve for X and compute error bounds as */
/*     described below. */

/*  4. The system of equations is solved for X using the factored form */
/*     of A. */

/*  5. Iterative refinement is applied to improve the computed solution */
/*     matrix and calculate error bounds and backward error estimates */
/*     for it. */

/*  6. If equilibration was used, the matrix X is premultiplied by */
/*     diag(S) so that it solves the original system before */
/*     equilibration. */

/*  Arguments */
/*  ========= */

/*  FACT    (input) CHARACTER*1 */
/*          Specifies whether or not the factored form of the matrix A is */
/*          supplied on entry, and if not, whether the matrix A should be */
/*          equilibrated before it is factored. */
/*          = 'F':  On entry, AFB contains the factored form of A. */
/*                  If EQUED = 'Y', the matrix A has been equilibrated */
/*                  with scaling factors given by S.  AB and AFB will not */
/*                  be modified. */
/*          = 'N':  The matrix A will be copied to AFB and factored. */
/*          = 'E':  The matrix A will be equilibrated if necessary, then */
/*                  copied to AFB and factored. */

/*  UPLO    (input) CHARACTER*1 */
/*          = 'U':  Upper triangle of A is stored; */
/*          = 'L':  Lower triangle of A is stored. */

/*  N       (input) INTEGER */
/*          The number of linear equations, i.e., the order of the */
/*          matrix A.  N >= 0. */

/*  KD      (input) INTEGER */
/*          The number of superdiagonals of the matrix A if UPLO = 'U', */
/*          or the number of subdiagonals if UPLO = 'L'.  KD >= 0. */

/*  NRHS    (input) INTEGER */
/*          The number of right-hand sides, i.e., the number of columns */
/*          of the matrices B and X.  NRHS >= 0. */

/*  AB      (input/output) COMPLEX array, dimension (LDAB,N) */
/*          On entry, the upper or lower triangle of the Hermitian band */
/*          matrix A, stored in the first KD+1 rows of the array, except */
/*          if FACT = 'F' and EQUED = 'Y', then A must contain the */
/*          equilibrated matrix diag(S)*A*diag(S).  The j-th column of A */
/*          is stored in the j-th column of the array AB as follows: */
/*          if UPLO = 'U', AB(KD+1+i-j,j) = A(i,j) for MAX(1,j-KD)<=i<=j; */
/*          if UPLO = 'L', AB(1+i-j,j)    = A(i,j) for j<=i<=MIN(N,j+KD). */
/*          See below for further details. */

/*          On exit, if FACT = 'E' and EQUED = 'Y', A is overwritten by */
/*          diag(S)*A*diag(S). */

/*  LDAB    (input) INTEGER */
/*          The leading dimension of the array A.  LDAB >= KD+1. */

/*  AFB     (input or output) COMPLEX array, dimension (LDAFB,N) */
/*          If FACT = 'F', then AFB is an input argument and on entry */
/*          contains the triangular factor U or L from the Cholesky */
/*          factorization A = U**H*U or A = L*L**H of the band matrix */
/*          A, in the same storage format as A (see AB).  If EQUED = 'Y', */
/*          then AFB is the factored form of the equilibrated matrix A. */

/*          If FACT = 'N', then AFB is an output argument and on exit */
/*          returns the triangular factor U or L from the Cholesky */
/*          factorization A = U**H*U or A = L*L**H. */

/*          If FACT = 'E', then AFB is an output argument and on exit */
/*          returns the triangular factor U or L from the Cholesky */
/*          factorization A = U**H*U or A = L*L**H of the equilibrated */
/*          matrix A (see the description of A for the form of the */
/*          equilibrated matrix). */

/*  LDAFB   (input) INTEGER */
/*          The leading dimension of the array AFB.  LDAFB >= KD+1. */

/*  EQUED   (input or output) CHARACTER*1 */
/*          Specifies the form of equilibration that was done. */
/*          = 'N':  No equilibration (always true if FACT = 'N'). */
/*          = 'Y':  Equilibration was done, i.e., A has been replaced by */
/*                  diag(S) * A * diag(S). */
/*          EQUED is an input argument if FACT = 'F'; otherwise, it is an */
/*          output argument. */

/*  S       (input or output) REAL array, dimension (N) */
/*          The scale factors for A; not accessed if EQUED = 'N'.  S is */
/*          an input argument if FACT = 'F'; otherwise, S is an output */
/*          argument.  If FACT = 'F' and EQUED = 'Y', each element of S */
/*          must be positive. */

/*  B       (input/output) COMPLEX array, dimension (LDB,NRHS) */
/*          On entry, the N-by-NRHS right hand side matrix B. */
/*          On exit, if EQUED = 'N', B is not modified; if EQUED = 'Y', */
/*          B is overwritten by diag(S) * B. */

/*  LDB     (input) INTEGER */
/*          The leading dimension of the array B.  LDB >= MAX(1,N). */

/*  X       (output) COMPLEX array, dimension (LDX,NRHS) */
/*          If INFO = 0 or INFO = N+1, the N-by-NRHS solution matrix X to */
/*          the original system of equations.  Note that if EQUED = 'Y', */
/*          A and B are modified on exit, and the solution to the */
/*          equilibrated system is inv(diag(S))*X. */

/*  LDX     (input) INTEGER */
/*          The leading dimension of the array X.  LDX >= MAX(1,N). */

/*  RCOND   (output) REAL */
/*          The estimate of the reciprocal condition number of the matrix */
/*          A after equilibration (if done).  If RCOND is less than the */
/*          machine precision (in particular, if RCOND = 0), the matrix */
/*          is singular to working precision.  This condition is */
/*          indicated by a return code of INFO > 0. */

/*  FERR    (output) REAL array, dimension (NRHS) */
/*          The estimated forward error bound for each solution vector */
/*          X(j) (the j-th column of the solution matrix X). */
/*          If XTRUE is the true solution corresponding to X(j), FERR(j) */
/*          is an estimated upper bound for the magnitude of the largest */
/*          element in (X(j) - XTRUE) divided by the magnitude of the */
/*          largest element in X(j).  The estimate is as reliable as */
/*          the estimate for RCOND, and is almost always a slight */
/*          overestimate of the true error. */

/*  BERR    (output) REAL array, dimension (NRHS) */
/*          The componentwise relative backward error of each solution */
/*          vector X(j) (i.e., the smallest relative change in */
/*          any element of A or B that makes X(j) an exact solution). */

/*  WORK    (workspace) COMPLEX array, dimension (2*N) */

/*  RWORK   (workspace) REAL array, dimension (N) */

/*  INFO    (output) INTEGER */
/*          = 0: successful exit */
/*          < 0: if INFO = -i, the i-th argument had an illegal value */
/*          > 0: if INFO = i, and i is */
/*                <= N:  the leading minor of order i of A is */
/*                       not positive definite, so the factorization */
/*                       could not be completed, and the solution has not */
/*                       been computed. RCOND = 0 is returned. */
/*                = N+1: U is nonsingular, but RCOND is less than machine */
/*                       precision, meaning that the matrix is singular */
/*                       to working precision.  Nevertheless, the */
/*                       solution and error bounds are computed because */
/*                       there are a number of situations where the */
/*                       computed solution can be more accurate than the */
/*                       value of RCOND would suggest. */

/*  Further Details */
/*  =============== */

/*  The band storage scheme is illustrated by the following example, when */
/*  N = 6, KD = 2, and UPLO = 'U': */

/*  Two-dimensional storage of the Hermitian matrix A: */

/*     a11  a12  a13 */
/*          a22  a23  a24 */
/*               a33  a34  a35 */
/*                    a44  a45  a46 */
/*                         a55  a56 */
/*     (aij=conjg(aji))         a66 */

/*  Band storage of the upper triangle of A: */

/*      *    *   a13  a24  a35  a46 */
/*      *   a12  a23  a34  a45  a56 */
/*     a11  a22  a33  a44  a55  a66 */

/*  Similarly, if UPLO = 'L' the format of A is as follows: */

/*     a11  a22  a33  a44  a55  a66 */
/*     a21  a32  a43  a54  a65   * */
/*     a31  a42  a53  a64   *    * */

/*  Array elements marked * are not used by the routine. */

/*  ===================================================================== */

/*     .. Parameters .. */
/*     .. */
/*     .. Local Scalars .. */
/*     .. */
/*     .. External Functions .. */
/*     .. */
/*     .. External Subroutines .. */
/*     .. */
/*     .. Intrinsic Functions .. */
/*     .. */
/*     .. Executable Statements .. */

    /* Parameter adjustments */
    ab_dim1 = *ldab;
    ab_offset = 1 + ab_dim1;
    ab -= ab_offset;
    afb_dim1 = *ldafb;
    afb_offset = 1 + afb_dim1;
    afb -= afb_offset;
    --s;
    b_dim1 = *ldb;
    b_offset = 1 + b_dim1;
    b -= b_offset;
    x_dim1 = *ldx;
    x_offset = 1 + x_dim1;
    x -= x_offset;
    --ferr;
    --berr;
    --work;
    --rwork;

    /* Function Body */
    *info = 0;
    nofact = lsame_(fact, "N");
    equil = lsame_(fact, "E");
    upper = lsame_(uplo, "U");
    if (nofact || equil) {
	*(unsigned char *)equed = 'N';
	rcequ = FALSE;
    } else {
	rcequ = lsame_(equed, "Y");
	smlnum = slamch_("Safe minimum");
	bignum = 1.f / smlnum;
    }

/*     Test the input parameters. */

    if (! nofact && ! equil && ! lsame_(fact, "F")) {
	*info = -1;
    } else if (! upper && ! lsame_(uplo, "L")) {
	*info = -2;
    } else if (*n < 0) {
	*info = -3;
    } else if (*kd < 0) {
	*info = -4;
    } else if (*nrhs < 0) {
	*info = -5;
    } else if (*ldab < *kd + 1) {
	*info = -7;
    } else if (*ldafb < *kd + 1) {
	*info = -9;
    } else if (lsame_(fact, "F") && ! (rcequ || lsame_(
	    equed, "N"))) {
	*info = -10;
    } else {
	if (rcequ) {
	    smin = bignum;
	    smax = 0.f;
	    i__1 = *n;
	    for (j = 1; j <= i__1; ++j) {
/* Computing MIN */
		r__1 = smin, r__2 = s[j];
		smin = MIN(r__1,r__2);
/* Computing MAX */
		r__1 = smax, r__2 = s[j];
		smax = MAX(r__1,r__2);
/* L10: */
	    }
	    if (smin <= 0.f) {
		*info = -11;
	    } else if (*n > 0) {
		scond = MAX(smin,smlnum) / MIN(smax,bignum);
	    } else {
		scond = 1.f;
	    }
	}
	if (*info == 0) {
	    if (*ldb < MAX(1,*n)) {
		*info = -13;
	    } else if (*ldx < MAX(1,*n)) {
		*info = -15;
	    }
	}
    }

    if (*info != 0) {
	i__1 = -(*info);
	xerbla_("CPBSVX", &i__1);
	return 0;
    }

    if (equil) {

/*        Compute row and column scalings to equilibrate the matrix A. */

	cpbequ_(uplo, n, kd, &ab[ab_offset], ldab, &s[1], &scond, &amax, &
		infequ);
	if (infequ == 0) {

/*           Equilibrate the matrix. */

	    claqhb_(uplo, n, kd, &ab[ab_offset], ldab, &s[1], &scond, &amax, 
		    equed);
	    rcequ = lsame_(equed, "Y");
	}
    }

/*     Scale the right-hand side. */

    if (rcequ) {
	i__1 = *nrhs;
	for (j = 1; j <= i__1; ++j) {
	    i__2 = *n;
	    for (i__ = 1; i__ <= i__2; ++i__) {
		i__3 = i__ + j * b_dim1;
		i__4 = i__;
		i__5 = i__ + j * b_dim1;
		q__1.r = s[i__4] * b[i__5].r, q__1.i = s[i__4] * b[i__5].i;
		b[i__3].r = q__1.r, b[i__3].i = q__1.i;
/* L20: */
	    }
/* L30: */
	}
    }

    if (nofact || equil) {

/*        Compute the Cholesky factorization A = U'*U or A = L*L'. */

	if (upper) {
	    i__1 = *n;
	    for (j = 1; j <= i__1; ++j) {
/* Computing MAX */
		i__2 = j - *kd;
		j1 = MAX(i__2,1);
		i__2 = j - j1 + 1;
		ccopy_(&i__2, &ab[*kd + 1 - j + j1 + j * ab_dim1], &c__1, &
			afb[*kd + 1 - j + j1 + j * afb_dim1], &c__1);
/* L40: */
	    }
	} else {
	    i__1 = *n;
	    for (j = 1; j <= i__1; ++j) {
/* Computing MIN */
		i__2 = j + *kd;
		j2 = MIN(i__2,*n);
		i__2 = j2 - j + 1;
		ccopy_(&i__2, &ab[j * ab_dim1 + 1], &c__1, &afb[j * afb_dim1 
			+ 1], &c__1);
/* L50: */
	    }
	}

	cpbtrf_(uplo, n, kd, &afb[afb_offset], ldafb, info);

/*        Return if INFO is non-zero. */

	if (*info > 0) {
	    *rcond = 0.f;
	    return 0;
	}
    }

/*     Compute the norm of the matrix A. */

    anorm = clanhb_("1", uplo, n, kd, &ab[ab_offset], ldab, &rwork[1]);

/*     Compute the reciprocal of the condition number of A. */

    cpbcon_(uplo, n, kd, &afb[afb_offset], ldafb, &anorm, rcond, &work[1], &
	    rwork[1], info);

/*     Compute the solution matrix X. */

    clacpy_("Full", n, nrhs, &b[b_offset], ldb, &x[x_offset], ldx);
    cpbtrs_(uplo, n, kd, nrhs, &afb[afb_offset], ldafb, &x[x_offset], ldx, 
	    info);

/*     Use iterative refinement to improve the computed solution and */
/*     compute error bounds and backward error estimates for it. */

    cpbrfs_(uplo, n, kd, nrhs, &ab[ab_offset], ldab, &afb[afb_offset], ldafb, 
	    &b[b_offset], ldb, &x[x_offset], ldx, &ferr[1], &berr[1], &work[1]
, &rwork[1], info);

/*     Transform the solution matrix X to a solution of the original */
/*     system. */

    if (rcequ) {
	i__1 = *nrhs;
	for (j = 1; j <= i__1; ++j) {
	    i__2 = *n;
	    for (i__ = 1; i__ <= i__2; ++i__) {
		i__3 = i__ + j * x_dim1;
		i__4 = i__;
		i__5 = i__ + j * x_dim1;
		q__1.r = s[i__4] * x[i__5].r, q__1.i = s[i__4] * x[i__5].i;
		x[i__3].r = q__1.r, x[i__3].i = q__1.i;
/* L60: */
	    }
/* L70: */
	}
	i__1 = *nrhs;
	for (j = 1; j <= i__1; ++j) {
	    ferr[j] /= scond;
/* L80: */
	}
    }

/*     Set INFO = N+1 if the matrix is singular to working precision. */

    if (*rcond < slamch_("Epsilon")) {
	*info = *n + 1;
    }

    return 0;

/*     End of CPBSVX */

} /* cpbsvx_ */