/*! \brief Performs one of the matrix-vector operations y := alpha*A*x + beta*y, or y := alpha*A'*x + beta*y
*
* <pre>
* Purpose
* =======
*
* sp_zgemv() performs one of the matrix-vector operations
* y := alpha*A*x + beta*y, or y := alpha*A'*x + beta*y,
* where alpha and beta are scalars, x and y are vectors and A is a
* sparse A->nrow by A->ncol matrix.
*
* Parameters
* ==========
*
* TRANS - (input) char*
* On entry, TRANS specifies the operation to be performed as
* follows:
* TRANS = 'N' or 'n' y := alpha*A*x + beta*y.
* TRANS = 'T' or 't' y := alpha*A'*x + beta*y.
* TRANS = 'C' or 'c' y := alpha*A'*x + beta*y.
*
* ALPHA - (input) doublecomplex
* On entry, ALPHA specifies the scalar alpha.
*
* A - (input) SuperMatrix*
* Before entry, the leading m by n part of the array A must
* contain the matrix of coefficients.
*
* X - (input) doublecomplex*, array of DIMENSION at least
* ( 1 + ( n - 1 )*abs( INCX ) ) when TRANS = 'N' or 'n'
* and at least
* ( 1 + ( m - 1 )*abs( INCX ) ) otherwise.
* Before entry, the incremented array X must contain the
* vector x.
*
* INCX - (input) int
* On entry, INCX specifies the increment for the elements of
* X. INCX must not be zero.
*
* BETA - (input) doublecomplex
* On entry, BETA specifies the scalar beta. When BETA is
* supplied as zero then Y need not be set on input.
*
* Y - (output) doublecomplex*, array of DIMENSION at least
* ( 1 + ( m - 1 )*abs( INCY ) ) when TRANS = 'N' or 'n'
* and at least
* ( 1 + ( n - 1 )*abs( INCY ) ) otherwise.
* Before entry with BETA non-zero, the incremented array Y
* must contain the vector y. On exit, Y is overwritten by the
* updated vector y.
*
* INCY - (input) int
* On entry, INCY specifies the increment for the elements of
* Y. INCY must not be zero.
*
* ==== Sparse Level 2 Blas routine.
* </pre>
*/
int
sp_zgemv(char *trans, doublecomplex alpha, SuperMatrix *A, doublecomplex *x,
int incx, doublecomplex beta, doublecomplex *y, int incy)
{
/* Local variables */
NCformat *Astore;
doublecomplex *Aval;
int info;
doublecomplex temp, temp1;
int lenx, leny, i, j, irow;
int iy, jx, jy, kx, ky;
int notran;
doublecomplex comp_zero = {0.0, 0.0};
doublecomplex comp_one = {1.0, 0.0};
notran = lsame_(trans, "N");
Astore = A->Store;
Aval = Astore->nzval;
/* Test the input parameters */
info = 0;
if ( !notran && !lsame_(trans, "T") && !lsame_(trans, "C")) info = 1;
else if ( A->nrow < 0 || A->ncol < 0 ) info = 3;
else if (incx == 0) info = 5;
else if (incy == 0) info = 8;
if (info != 0) {
xerbla_("sp_zgemv ", &info);
return 0;
}
/* Quick return if possible. */
if (A->nrow == 0 || A->ncol == 0 ||
z_eq(&alpha, &comp_zero) &&
z_eq(&beta, &comp_one))
return 0;
/* Set LENX and LENY, the lengths of the vectors x and y, and set
up the start points in X and Y. */
if (lsame_(trans, "N")) {
lenx = A->ncol;
leny = A->nrow;
} else {
lenx = A->nrow;
leny = A->ncol;
}
if (incx > 0) kx = 0;
else kx = - (lenx - 1) * incx;
if (incy > 0) ky = 0;
else ky = - (leny - 1) * incy;
/* Start the operations. In this version the elements of A are
accessed sequentially with one pass through A. */
/* First form y := beta*y. */
if ( !z_eq(&beta, &comp_one) ) {
if (incy == 1) {
if ( z_eq(&beta, &comp_zero) )
for (i = 0; i < leny; ++i) y[i] = comp_zero;
else
for (i = 0; i < leny; ++i)
zz_mult(&y[i], &beta, &y[i]);
} else {
iy = ky;
if ( z_eq(&beta, &comp_zero) )
for (i = 0; i < leny; ++i) {
y[iy] = comp_zero;
iy += incy;
}
else
for (i = 0; i < leny; ++i) {
zz_mult(&y[iy], &beta, &y[iy]);
iy += incy;
}
}
}
if ( z_eq(&alpha, &comp_zero) ) return 0;
if ( notran ) {
/* Form y := alpha*A*x + y. */
jx = kx;
if (incy == 1) {
for (j = 0; j < A->ncol; ++j) {
if ( !z_eq(&x[jx], &comp_zero) ) {
zz_mult(&temp, &alpha, &x[jx]);
for (i = Astore->colptr[j]; i < Astore->colptr[j+1]; ++i) {
irow = Astore->rowind[i];
zz_mult(&temp1, &temp, &Aval[i]);
z_add(&y[irow], &y[irow], &temp1);
}
}
jx += incx;
}
} else {
ABORT("Not implemented.");
}
} else {
/* Form y := alpha*A'*x + y. */
jy = ky;
if (incx == 1) {
for (j = 0; j < A->ncol; ++j) {
temp = comp_zero;
for (i = Astore->colptr[j]; i < Astore->colptr[j+1]; ++i) {
irow = Astore->rowind[i];
zz_mult(&temp1, &Aval[i], &x[irow]);
z_add(&temp, &temp, &temp1);
}
zz_mult(&temp1, &alpha, &temp);
z_add(&y[jy], &y[jy], &temp1);
jy += incy;
}
} else {
ABORT("Not implemented.");
}
}
return 0;
} /* sp_zgemv */
int
sp_zgemv(char *trans, doublecomplex alpha, SuperMatrix *A, doublecomplex *x,
int incx, doublecomplex beta, doublecomplex *y, int incy)
{
/* Purpose
=======
sp_zgemv() performs one of the matrix-vector operations
y := alpha*A*x + beta*y, or y := alpha*A'*x + beta*y,
where alpha and beta are scalars, x and y are vectors and A is a
sparse A->nrow by A->ncol matrix.
Parameters
==========
TRANS - (input) char*
On entry, TRANS specifies the operation to be performed as
follows:
TRANS = 'N' or 'n' y := alpha*A*x + beta*y.
TRANS = 'T' or 't' y := alpha*A'*x + beta*y.
TRANS = 'C' or 'c' y := alpha*A'*x + beta*y.
ALPHA - (input) doublecomplex
On entry, ALPHA specifies the scalar alpha.
A - (input) SuperMatrix*
Before entry, the leading m by n part of the array A must
contain the matrix of coefficients.
X - (input) doublecomplex*, array of DIMENSION at least
( 1 + ( n - 1 )*abs( INCX ) ) when TRANS = 'N' or 'n'
and at least
( 1 + ( m - 1 )*abs( INCX ) ) otherwise.
Before entry, the incremented array X must contain the
vector x.
INCX - (input) int
On entry, INCX specifies the increment for the elements of
X. INCX must not be zero.
BETA - (input) doublecomplex
On entry, BETA specifies the scalar beta. When BETA is
supplied as zero then Y need not be set on input.
Y - (output) doublecomplex*, array of DIMENSION at least
( 1 + ( m - 1 )*abs( INCY ) ) when TRANS = 'N' or 'n'
and at least
( 1 + ( n - 1 )*abs( INCY ) ) otherwise.
Before entry with BETA non-zero, the incremented array Y
must contain the vector y. On exit, Y is overwritten by the
updated vector y.
INCY - (input) int
On entry, INCY specifies the increment for the elements of
Y. INCY must not be zero.
==== Sparse Level 2 Blas routine.
*/
/* Local variables */
NCformat *Astore;
doublecomplex *Aval;
int info;
doublecomplex temp, temp1;
int lenx, leny, i, j, irow;
int iy, jx, jy, kx, ky;
int notran;
doublecomplex comp_zero = {0.0, 0.0};
doublecomplex comp_one = {1.0, 0.0};
notran = lsame_(trans, "N");
Astore = A->Store;
Aval = Astore->nzval;
/* Test the input parameters */
info = 0;
if ( !notran && !lsame_(trans, "T") && !lsame_(trans, "C")) info = 1;
else if ( A->nrow < 0 || A->ncol < 0 ) info = 3;
else if (incx == 0) info = 5;
else if (incy == 0) info = 8;
if (info != 0) {
xerbla_("sp_zgemv ", &info);
return 0;
}
/* Quick return if possible. */
if (A->nrow == 0 || A->ncol == 0 ||
z_eq(&alpha, &comp_zero) &&
z_eq(&beta, &comp_one))
return 0;
/* Set LENX and LENY, the lengths of the vectors x and y, and set
up the start points in X and Y. */
if (lsame_(trans, "N")) {
lenx = A->ncol;
leny = A->nrow;
} else {
lenx = A->nrow;
leny = A->ncol;
}
if (incx > 0) kx = 0;
else kx = - (lenx - 1) * incx;
if (incy > 0) ky = 0;
else ky = - (leny - 1) * incy;
/* Start the operations. In this version the elements of A are
accessed sequentially with one pass through A. */
/* First form y := beta*y. */
if ( !z_eq(&beta, &comp_one) ) {
if (incy == 1) {
if ( z_eq(&beta, &comp_zero) )
for (i = 0; i < leny; ++i) y[i] = comp_zero;
else
for (i = 0; i < leny; ++i)
zz_mult(&y[i], &beta, &y[i]);
} else {
iy = ky;
if ( z_eq(&beta, &comp_zero) )
for (i = 0; i < leny; ++i) {
y[iy] = comp_zero;
iy += incy;
}
else
for (i = 0; i < leny; ++i) {
zz_mult(&y[iy], &beta, &y[iy]);
iy += incy;
}
}
}
if ( z_eq(&alpha, &comp_zero) ) return 0;
if ( notran ) {
/* Form y := alpha*A*x + y. */
jx = kx;
if (incy == 1) {
for (j = 0; j < A->ncol; ++j) {
if ( !z_eq(&x[jx], &comp_zero) ) {
zz_mult(&temp, &alpha, &x[jx]);
for (i = Astore->colptr[j]; i < Astore->colptr[j+1]; ++i) {
irow = Astore->rowind[i];
zz_mult(&temp1, &temp, &Aval[i]);
z_add(&y[irow], &y[irow], &temp1);
}
}
jx += incx;
}
} else {
ABORT("Not implemented.");
}
} else {
/* Form y := alpha*A'*x + y. */
jy = ky;
if (incx == 1) {
for (j = 0; j < A->ncol; ++j) {
temp = comp_zero;
for (i = Astore->colptr[j]; i < Astore->colptr[j+1]; ++i) {
irow = Astore->rowind[i];
zz_mult(&temp1, &Aval[i], &x[irow]);
z_add(&temp, &temp, &temp1);
}
zz_mult(&temp1, &alpha, &temp);
z_add(&y[jy], &y[jy], &temp1);
jy += incy;
}
} else {
ABORT("Not implemented.");
}
}
return 0;
} /* sp_zgemv */
/*! \brief
* <pre>
* Purpose
* =======
* ilu_zdrop_row() - Drop some small rows from the previous
* supernode (L-part only).
* </pre>
*/
int ilu_zdrop_row(
superlu_options_t *options, /* options */
int first, /* index of the first column in the supernode */
int last, /* index of the last column in the supernode */
double drop_tol, /* dropping parameter */
int quota, /* maximum nonzero entries allowed */
int *nnzLj, /* in/out number of nonzeros in L(:, 1:last) */
double *fill_tol, /* in/out - on exit, fill_tol=-num_zero_pivots,
* does not change if options->ILU_MILU != SMILU1 */
GlobalLU_t *Glu, /* modified */
double dwork[], /* working space
* the length of dwork[] should be no less than
* the number of rows in the supernode */
double dwork2[], /* working space with the same size as dwork[],
* used only by the second dropping rule */
int lastc /* if lastc == 0, there is nothing after the
* working supernode [first:last];
* if lastc == 1, there is one more column after
* the working supernode. */ )
{
register int i, j, k, m1;
register int nzlc; /* number of nonzeros in column last+1 */
register int xlusup_first, xlsub_first;
int m, n; /* m x n is the size of the supernode */
int r = 0; /* number of dropped rows */
register double *temp;
register doublecomplex *lusup = Glu->lusup;
register int *lsub = Glu->lsub;
register int *xlsub = Glu->xlsub;
register int *xlusup = Glu->xlusup;
register double d_max = 0.0, d_min = 1.0;
int drop_rule = options->ILU_DropRule;
milu_t milu = options->ILU_MILU;
norm_t nrm = options->ILU_Norm;
doublecomplex zero = {0.0, 0.0};
doublecomplex one = {1.0, 0.0};
doublecomplex none = {-1.0, 0.0};
int i_1 = 1;
int inc_diag; /* inc_diag = m + 1 */
int nzp = 0; /* number of zero pivots */
double alpha = pow((double)(Glu->n), -1.0 / options->ILU_MILU_Dim);
xlusup_first = xlusup[first];
xlsub_first = xlsub[first];
m = xlusup[first + 1] - xlusup_first;
n = last - first + 1;
m1 = m - 1;
inc_diag = m + 1;
nzlc = lastc ? (xlusup[last + 2] - xlusup[last + 1]) : 0;
temp = dwork - n;
/* Quick return if nothing to do. */
if (m == 0 || m == n || drop_rule == NODROP)
{
*nnzLj += m * n;
return 0;
}
/* basic dropping: ILU(tau) */
for (i = n; i <= m1; )
{
/* the average abs value of ith row */
switch (nrm)
{
case ONE_NORM:
temp[i] = dzasum_(&n, &lusup[xlusup_first + i], &m) / (double)n;
break;
case TWO_NORM:
temp[i] = dznrm2_(&n, &lusup[xlusup_first + i], &m)
/ sqrt((double)n);
break;
case INF_NORM:
default:
k = izamax_(&n, &lusup[xlusup_first + i], &m) - 1;
temp[i] = z_abs1(&lusup[xlusup_first + i + m * k]);
break;
}
/* drop small entries due to drop_tol */
if (drop_rule & DROP_BASIC && temp[i] < drop_tol)
{
r++;
/* drop the current row and move the last undropped row here */
if (r > 1) /* add to last row */
{
/* accumulate the sum (for MILU) */
switch (milu)
{
case SMILU_1:
case SMILU_2:
zaxpy_(&n, &one, &lusup[xlusup_first + i], &m,
&lusup[xlusup_first + m - 1], &m);
break;
case SMILU_3:
for (j = 0; j < n; j++)
lusup[xlusup_first + (m - 1) + j * m].r +=
z_abs1(&lusup[xlusup_first + i + j * m]);
break;
case SILU:
default:
break;
}
zcopy_(&n, &lusup[xlusup_first + m1], &m,
&lusup[xlusup_first + i], &m);
} /* if (r > 1) */
else /* move to last row */
{
zswap_(&n, &lusup[xlusup_first + m1], &m,
&lusup[xlusup_first + i], &m);
if (milu == SMILU_3)
for (j = 0; j < n; j++) {
lusup[xlusup_first + m1 + j * m].r =
z_abs1(&lusup[xlusup_first + m1 + j * m]);
lusup[xlusup_first + m1 + j * m].i = 0.0;
}
}
lsub[xlsub_first + i] = lsub[xlsub_first + m1];
m1--;
continue;
} /* if dropping */
else
{
if (temp[i] > d_max) d_max = temp[i];
if (temp[i] < d_min) d_min = temp[i];
}
i++;
} /* for */
/* Secondary dropping: drop more rows according to the quota. */
quota = ceil((double)quota / (double)n);
if (drop_rule & DROP_SECONDARY && m - r > quota)
{
register double tol = d_max;
/* Calculate the second dropping tolerance */
if (quota > n)
{
if (drop_rule & DROP_INTERP) /* by interpolation */
{
d_max = 1.0 / d_max; d_min = 1.0 / d_min;
tol = 1.0 / (d_max + (d_min - d_max) * quota / (m - n - r));
}
else /* by quick select */
{
int len = m1 - n + 1;
dcopy_(&len, dwork, &i_1, dwork2, &i_1);
tol = dqselect(len, dwork2, quota - n);
#if 0
register int *itemp = iwork - n;
A = temp;
for (i = n; i <= m1; i++) itemp[i] = i;
qsort(iwork, m1 - n + 1, sizeof(int), _compare_);
tol = temp[itemp[quota]];
#endif
}
}
for (i = n; i <= m1; )
{
if (temp[i] <= tol)
{
register int j;
r++;
/* drop the current row and move the last undropped row here */
if (r > 1) /* add to last row */
{
/* accumulate the sum (for MILU) */
switch (milu)
{
case SMILU_1:
case SMILU_2:
zaxpy_(&n, &one, &lusup[xlusup_first + i], &m,
&lusup[xlusup_first + m - 1], &m);
break;
case SMILU_3:
for (j = 0; j < n; j++)
lusup[xlusup_first + (m - 1) + j * m].r +=
z_abs1(&lusup[xlusup_first + i + j * m]);
break;
case SILU:
default:
break;
}
zcopy_(&n, &lusup[xlusup_first + m1], &m,
&lusup[xlusup_first + i], &m);
} /* if (r > 1) */
else /* move to last row */
{
zswap_(&n, &lusup[xlusup_first + m1], &m,
&lusup[xlusup_first + i], &m);
if (milu == SMILU_3)
for (j = 0; j < n; j++) {
lusup[xlusup_first + m1 + j * m].r =
z_abs1(&lusup[xlusup_first + m1 + j * m]);
lusup[xlusup_first + m1 + j * m].i = 0.0;
}
}
lsub[xlsub_first + i] = lsub[xlsub_first + m1];
m1--;
temp[i] = temp[m1];
continue;
}
i++;
} /* for */
} /* if secondary dropping */
for (i = n; i < m; i++) temp[i] = 0.0;
if (r == 0)
{
*nnzLj += m * n;
return 0;
}
/* add dropped entries to the diagnal */
if (milu != SILU)
{
register int j;
doublecomplex t;
double omega;
for (j = 0; j < n; j++)
{
t = lusup[xlusup_first + (m - 1) + j * m];
if (t.r == 0.0 && t.i == 0.0) continue;
omega = SUPERLU_MIN(2.0 * (1.0 - alpha) / z_abs1(&t), 1.0);
zd_mult(&t, &t, omega);
switch (milu)
{
case SMILU_1:
if ( !(z_eq(&t, &none)) ) {
z_add(&t, &t, &one);
zz_mult(&lusup[xlusup_first + j * inc_diag],
&lusup[xlusup_first + j * inc_diag],
&t);
}
else
{
zd_mult(
&lusup[xlusup_first + j * inc_diag],
&lusup[xlusup_first + j * inc_diag],
*fill_tol);
#ifdef DEBUG
printf("[1] ZERO PIVOT: FILL col %d.\n", first + j);
fflush(stdout);
#endif
nzp++;
}
break;
case SMILU_2:
zd_mult(&lusup[xlusup_first + j * inc_diag],
&lusup[xlusup_first + j * inc_diag],
1.0 + z_abs1(&t));
break;
case SMILU_3:
z_add(&t, &t, &one);
zz_mult(&lusup[xlusup_first + j * inc_diag],
&lusup[xlusup_first + j * inc_diag],
&t);
break;
case SILU:
default:
break;
}
}
if (nzp > 0) *fill_tol = -nzp;
}
/* Remove dropped entries from the memory and fix the pointers. */
m1 = m - r;
for (j = 1; j < n; j++)
{
register int tmp1, tmp2;
tmp1 = xlusup_first + j * m1;
tmp2 = xlusup_first + j * m;
for (i = 0; i < m1; i++)
lusup[i + tmp1] = lusup[i + tmp2];
}
for (i = 0; i < nzlc; i++)
lusup[xlusup_first + i + n * m1] = lusup[xlusup_first + i + n * m];
for (i = 0; i < nzlc; i++)
lsub[xlsub[last + 1] - r + i] = lsub[xlsub[last + 1] + i];
for (i = first + 1; i <= last + 1; i++)
{
xlusup[i] -= r * (i - first);
xlsub[i] -= r;
}
if (lastc)
{
xlusup[last + 2] -= r * n;
xlsub[last + 2] -= r;
}
*nnzLj += (m - r) * n;
return r;
}
