void ATL_zrefhpmv ( const enum ATLAS_UPLO UPLO, const int N, const double * ALPHA, const double * A, const double * X, const int INCX, const double * BETA, double * Y, const int INCY ) { /* * Purpose * ======= * * ATL_zrefhpmv performs the matrix-vector operation * * y := alpha * A * x + beta * y, * * where alpha and beta are scalars, x and y are n-element vectors and A * is an n by n Hermitian matrix, supplied in packed form. * * Arguments * ========= * * UPLO (input) const enum ATLAS_UPLO * On entry, UPLO specifies whether the upper or lower triangu- * lar part of the matrix A is supplied in the packed array A * as follows: * * UPLO = AtlasUpper The upper triangular part of A is * supplied in A. * * UPLO = AtlasLower The lower triangular part of A is * supplied in A. * * Unchanged on exit. * * N (input) const int * On entry, N specifies the order of the matrix A. N must be at * least zero. Unchanged on exit. * * ALPHA (input) const double * * On entry, ALPHA specifies the scalar alpha. When ALPHA is * supplied as zero then A and X need not be set on input. Un- * changed on exit. * * A (input) const double * * On entry, A points to an array of size equal to or greater * than (( n*(n+1) ) / 2) * sizeof( double[2] ). Before entry * with UPLO = AtlasUpper, the array A must contain the upper * triangular part of the Hermitian matrix packed sequentially, * column by column, so that A[ 0 ] contains a(0,0), A[ 1 ] and * A[ 2 ] contain a(0,1) and a(1,1) respectively, and so on. * Before entry with UPLO = AtlasLower, the array A must contain * the lower triangular part of the Hermitian matrix packed se- * quentially, column by column, so that A[ 0 ] contains a(0,0), * A[ 1 ] and A[ 2 ] contain a(1,0) and a(2,0) respectively, and * so on. Unchanged on exit. * Note that the imaginary parts of the local entries corres- * ponding to the diagonal elements of A need not be set and as- * sumed to be zero. Unchanged on exit. * * X (input) const double * * On entry, X points to the first entry to be accessed of an * incremented array of size equal to or greater than * ( 1 + ( n - 1 ) * abs( INCX ) ) * sizeof( double[2] ), * that contains the vector x. Unchanged on exit. * * INCX (input) const int * On entry, INCX specifies the increment for the elements of X. * INCX must not be zero. Unchanged on exit. * * BETA (input) const double * * On entry, BETA specifies the scalar beta. When BETA is * supplied as zero then Y need not be set on input. Unchanged * on exit. * * Y (input/output) double * * On entry, Y points to the first entry to be accessed of an * incremented array of size equal to or greater than * ( 1 + ( n - 1 ) * abs( INCY ) ) * sizeof( double[2] ), * that contains the vector y. 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) const int * On entry, INCY specifies the increment for the elements of Y. * INCY must not be zero. Unchanged on exit. * * --------------------------------------------------------------------- */ /* .. * .. Executable Statements .. * */ if( ( N == 0 ) || ( Mdzero( ALPHA[0], ALPHA[1] ) && Mdone( BETA[0], BETA[1] ) ) ) return; if( Mdzero( ALPHA[0], ALPHA[1] ) ) { Mzvscal( N, BETA, Y, INCY ); return; } if( UPLO == AtlasUpper ) { ATL_zrefhpmvU( N, ALPHA, A, 1, X, INCX, BETA, Y, INCY ); } else { ATL_zrefhpmvL( N, ALPHA, A, N, X, INCX, BETA, Y, INCY ); } /* * End of ATL_zrefhpmv */ }
void ATL_zrefgbmv ( const enum ATLAS_TRANS TRANS, const int M, const int N, const int KL, const int KU, const double * ALPHA, const double * A, const int LDA, const double * X, const int INCX, const double * BETA, double * Y, const int INCY ) { /* * Purpose * ======= * * ATL_zrefgbmv performs one of the matrix-vector operations * * y := alpha * op( A ) * x + beta * y, * * where op( X ) is one of * * op( X ) = X or op( X ) = conjg( X ) or * * op( X ) = X' or op( X ) = conjg( X' ). * * where alpha and beta are scalars, x and y are vectors and op( A ) is * an m by n band matrix, with kl sub-diagonals and ku super-diagonals. * * Arguments * ========= * * TRANS (input) const enum ATLAS_TRANS * On entry, TRANS specifies the operation to be performed as * follows: * * TRANS = AtlasNoTrans y := alpha*A *x + beta*y, * * TRANS = AtlasConj y := alpha*conjg( A )*x + beta*y, * * TRANS = AtlasTrans y := alpha*A'*x + beta*y, * * TRANS = AtlasConjTrans y := alpha*conjg( A' )*x + beta*y. * * Unchanged on exit. * * M (input) const int * On entry, M specifies the number of rows of the matrix A * when TRANS = AtlasNoTrans or TRANS = AtlasConj, and the num- * ber of columns of the matrix A otherwise. M must be at least * zero. Unchanged on exit. * * N (input) const int * On entry, N specifies the number of columns of the matrix A * when TRANS = AtlasNoTrans or TRANS = AtlasConj, and the num- * ber of rows of the matrix A otherwise. N must be at least ze- * ro. Unchanged on exit. * * KL (input) const int * On entry, KL specifies the number of sub-diagonals of the ma- * trix A. KL must satisfy 0 <= KL. Unchanged on exit. * * KU (input) const int * On entry, KU specifies the number of super-diagonals of the * matrix A. KU must satisfy 0 <= KU. Unchanged on exit. * * ALPHA (input) const double * * On entry, ALPHA specifies the scalar alpha. When ALPHA is * supplied as zero then A and X need not be set on input. Un- * changed on exit. * * A (input) const double * * On entry, A points to an array of size equal to or greater * than LDA * ka * sizeof( double[2] ), where ka is n when * TRANS = AtlasNotrans or TRANS = AtlasConj, and m otherwise. * Before entry, the leading ( kl + ku + 1 ) by ka part of the * array A must contain the matrix of coefficients, supplied * column by column, with the leading diagonal of the matrix in * row ku of the array, the first super-diagonal starting at po- * sition 1 in row ku-1, the first sub-diagonal starting at po- * sition 0 in row ku+1, and so on. Elements in the array A that * do not correspond to elements in the band matrix (such as the * top left ku by ku triangle) are not referenced. Unchanged on * exit. * * The following program segment will transfer a real band ma- * trix from conventional full matrix storage to band storage: * * for( j = 0; j < n; j++ ) * { * k = ku - j; i1 = ( m > j + kl + 1 ? j + kl + 1 : m ); * for( i = ( k < 0 ? -k : 0 ); i < i1; i++ ) * { * a[((k+i+j*LDA)<<1)+0] = real( matrix( i, j ) ); * a[((k+i+j*LDA)<<1)+1] = imag( matrix( i, j ) ); * } * } * * LDA (input) const int * On entry, LDA specifies the leading dimension of A as decla- * red in the calling (sub) program. LDA must be at least * ( kl + ku + 1 ). Unchanged on exit. * * X (input) const double * * On entry, X points to the first entry to be accessed of an * incremented array of size equal to or greater than * ( 1 + ( n - 1 ) * abs( INCX ) ) * sizeof( double[2] ), * that contains the vector x. Unchanged on exit. * * INCX (input) const int * On entry, INCX specifies the increment for the elements of X. * INCX must not be zero. Unchanged on exit. * * BETA (input) const double * * On entry, BETA specifies the scalar beta. When BETA is * supplied as zero then Y need not be set on input. Unchanged * on exit. * * Y (input/output) double * * On entry, Y points to the first entry to be accessed of an * incremented array of size equal to or greater than * ( 1 + ( m - 1 ) * abs( INCY ) ) * sizeof( double[2] ), * that contains the vector y. 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) const int * On entry, INCY specifies the increment for the elements of Y. * INCY must not be zero. Unchanged on exit. * * --------------------------------------------------------------------- */ /* .. * .. Executable Statements .. * */ if( ( M == 0 ) || ( N == 0 ) || ( Mdzero( ALPHA[0], ALPHA[1] ) && Mdone( BETA[0], BETA[1] ) ) ) return; if( Mdzero( ALPHA[0], ALPHA[1] ) ) { Mzvscal( M, BETA, Y, INCY ); return; } if( TRANS == AtlasNoTrans ) { ATL_zrefgbmvN( M, N, KL, KU, ALPHA, A, LDA, X, INCX, BETA, Y, INCY ); } else if( TRANS == AtlasConj ) { ATL_zrefgbmvC( M, N, KL, KU, ALPHA, A, LDA, X, INCX, BETA, Y, INCY ); } else if( TRANS == AtlasTrans ) { ATL_zrefgbmvT( M, N, KL, KU, ALPHA, A, LDA, X, INCX, BETA, Y, INCY ); } else { ATL_zrefgbmvH( M, N, KL, KU, ALPHA, A, LDA, X, INCX, BETA, Y, INCY ); } /* * End of ATL_zrefgbmv */ }
void ATL_zrefsymm ( const enum ATLAS_SIDE SIDE, const enum ATLAS_UPLO UPLO, const int M, const int N, const double * ALPHA, const double * A, const int LDA, const double * B, const int LDB, const double * BETA, double * C, const int LDC ) { /* * Purpose * ======= * * ATL_zrefsymm performs one of the matrix-matrix operations * * C := alpha * A * B + beta * C, * * or * * C := alpha * B * A + beta * C, * * where alpha and beta are scalars, A is a symmetric matrix and B and * C are m by n matrices. * * Arguments * ========= * * SIDE (input) const enum ATLAS_SIDE * On entry, SIDE specifies whether the symmetric matrix A * appears on the left or right in the operation as follows: * * SIDE = AtlasLeft C := alpha * A * B + beta * C, * * SIDE = AtlasRight C := alpha * B * A + beta * C. * * Unchanged on exit. * * UPLO (input) const enum ATLAS_UPLO * On entry, UPLO specifies whether the upper or lower triangu- * lar part of the array A is to be referenced as follows: * * UPLO = AtlasUpper Only the upper triangular part of A * is to be referenced. * * UPLO = AtlasLower Only the lower triangular part of A * is to be referenced. * * Unchanged on exit. * * M (input) const int * On entry, M specifies the number of rows of the matrix C. * M must be at least zero. Unchanged on exit. * * N (input) const int * On entry, N specifies the number of columns of the matrix C. * N must be at least zero. Unchanged on exit. * * ALPHA (input) const double * * On entry, ALPHA specifies the scalar alpha. When ALPHA is * supplied as zero then the elements of the matrices A and B * need not be set on input. * * A (input) const double * * On entry, A points to an array of size equal to or greater * than LDA * ka * sizeof( double[2] ), where ka is m when * SIDE = AtlasLeft and is n otherwise. Before entry with * SIDE = AtlasLeft, the m by m part of the array A must con- * tain the symmetric matrix, such that when UPLO = AtlasUpper, * the leading m by m upper triangular part of the array A must * contain the upper triangular part of the symmetric matrix and * the strictly lower triangular part of A is not referenced, * and when UPLO = AtlasLower, the leading m by m lower trian- * gular part of the array A must contain the lower triangular * part of the symmetric matrix and the strictly upper triangu- * lar part of A is not referenced. * Before entry with SIDE = AtlasRight, the n by n part of * the array A must contain the symmetric matrix, such that * when UPLO = AtlasUpper, the leading n by n upper triangular * part of the array A must contain the upper triangular part * of the symmetric matrix and the strictly lower triangular * part of A is not referenced, and when UPLO = AtlasLower, * the leading n by n lower triangular part of the array A * must contain the lower triangular part of the symmetric * matrix and the strictly upper triangular part of A is not * referenced. Unchanged on exit. * * LDA (input) const int * On entry, LDA specifies the leading dimension of A as decla- * red in the calling (sub) program. LDA must be at least * MAX( 1, m ) when SIDE = AtlasLeft, and MAX( 1, n ) otherwise. * Unchanged on exit. * * B (input) const double * * On entry, B points to an array of size equal to or greater * than LDB * n * sizeof( double[2] ). Before entry, the lea- * ding m by n part of the array B must contain the matrix B. * Unchanged on exit. * * LDB (input) const int * On entry, LDB specifies the leading dimension of B as decla- * red in the calling (sub) program. LDB must be at least * MAX( 1, m ). wise. Unchanged on exit. * * BETA (input) const double * * On entry, BETA specifies the scalar beta. When BETA is * supplied as zero then the elements of the matrix C need * not be set on input. Unchanged on exit. * * C (input/output) double * * On entry, C points to an array of size equal to or greater * than LDC * n * sizeof( double[2] ). Before entry, the lea- * ding m by n part of the array C must contain the matrix C, * except when beta is zero, in which case C need not be set on * entry. On exit, the array C is overwritten by the m by n up- * dated matrix. * * LDC (input) const int * On entry, LDC specifies the leading dimension of A as decla- * red in the calling (sub) program. LDC must be at least * MAX( 1, m ). Unchanged on exit. * * --------------------------------------------------------------------- */ /* .. * .. Executable Statements .. * */ if( ( M == 0 ) || ( N == 0 ) || ( Mdzero( ALPHA[0], ALPHA[1] ) && Mdone ( BETA [0], BETA [1] ) ) ) return; if( Mdzero( ALPHA[0], ALPHA[1] ) ) { Mzgescal( M, N, BETA, C, LDC ); return; } if( SIDE == AtlasLeft ) { if( UPLO == AtlasUpper ) { ATL_zrefsymmLU( M, N, ALPHA, A, LDA, B, LDB, BETA, C, LDC ); } else { ATL_zrefsymmLL( M, N, ALPHA, A, LDA, B, LDB, BETA, C, LDC ); } } else { if( UPLO == AtlasUpper ) { ATL_zrefsymmRU( M, N, ALPHA, A, LDA, B, LDB, BETA, C, LDC ); } else { ATL_zrefsymmRL( M, N, ALPHA, A, LDA, B, LDB, BETA, C, LDC ); } } /* * End of ATL_zrefsymm */ }
void ATL_zrefgemv ( const enum ATLAS_TRANS TRANS, const int M, const int N, const double * ALPHA, const double * A, const int LDA, const double * X, const int INCX, const double * BETA, double * Y, const int INCY ) { /* * Purpose * ======= * * ATL_zrefgemv performs one of the matrix-vector operations * * y := alpha * op( A ) * x + beta * y, * * where op( X ) is one of * * op( X ) = X or op( X ) = conjg( X ) or * * op( X ) = X' or op( X ) = conjg( X' ). * * where alpha and beta are scalars, x and y are vectors and op( A ) is * an m by n matrix. * * Arguments * ========= * * TRANS (input) const enum ATLAS_TRANS * On entry, TRANS specifies the operation to be performed as * follows: * * TRANS = AtlasNoTrans y := alpha*A *x + beta*y, * * TRANS = AtlasConj y := alpha*conjg( A )*x + beta*y, * * TRANS = AtlasTrans y := alpha*A'*x + beta*y, * * TRANS = AtlasConjTrans y := alpha*conjg( A' )*x + beta*y. * * Unchanged on exit. * * M (input) const int * On entry, M specifies the number of rows of the matrix A * when TRANS = AtlasNoTrans or TRANS = AtlasConj, and the num- * ber of columns of the matrix A otherwise. M must be at least * zero. Unchanged on exit. * * N (input) const int * On entry, N specifies the number of columns of the matrix A * when TRANS = AtlasNoTrans or TRANS = AtlasConj, and the num- * ber of rows of the matrix A otherwise. N must be at least ze- * ro. Unchanged on exit. * * ALPHA (input) const double * * On entry, ALPHA specifies the scalar alpha. When ALPHA is * supplied as zero then A and X need not be set on input. Un- * changed on exit. * * A (input) const double * * On entry, A points to an array of size equal to or greater * than LDA * ka * sizeof( double[2] ), where ka is n when * TRANS = AtlasNotrans or TRANS = AtlasConj, and m otherwise. * Before entry, when TRANS = AtlasNotrans or TRANS = AtlasConj, * the leading m by n part of the array A must contain the ma- * trix coefficients, and otherwise the leading n by m part of * the array A must contain the matrix coefficients. Unchanged * on exit. * * LDA (input) const int * On entry, LDA specifies the leading dimension of A as decla- * red in the calling (sub) program. LDA must be at least * MAX( 1, m ) when TRANS = AtlasNotrans or TRANS = AtlasConj, * and MAX( 1, n ) otherwise. Unchanged on exit. * * X (input) const double * * On entry, X points to the first entry to be accessed of an * incremented array of size equal to or greater than * ( 1 + ( n - 1 ) * abs( INCX ) ) * sizeof( double[2] ), * that contains the vector x. Unchanged on exit. * * INCX (input) const int * On entry, INCX specifies the increment for the elements of X. * INCX must not be zero. Unchanged on exit. * * BETA (input) const double * * On entry, BETA specifies the scalar beta. When BETA is * supplied as zero then Y need not be set on input. Unchanged * on exit. * * Y (input/output) double * * On entry, Y points to the first entry to be accessed of an * incremented array of size equal to or greater than * ( 1 + ( m - 1 ) * abs( INCY ) ) * sizeof( double[2] ), * that contains the vector y. 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) const int * On entry, INCY specifies the increment for the elements of Y. * INCY must not be zero. Unchanged on exit. * * --------------------------------------------------------------------- */ /* .. * .. Executable Statements .. * */ if( ( M == 0 ) || ( N == 0 ) || ( Mdzero( ALPHA[0], ALPHA[1] ) && Mdone( BETA[0], BETA[1] ) ) ) return; if( Mdzero( ALPHA[0], ALPHA[1] ) ) { Mzvscal( M, BETA, Y, INCY ); return; } if( TRANS == AtlasNoTrans ) { ATL_zrefgemvN( M, N, ALPHA, A, LDA, X, INCX, BETA, Y, INCY ); } else if( TRANS == AtlasConj ) { ATL_zrefgemvC( M, N, ALPHA, A, LDA, X, INCX, BETA, Y, INCY ); } else if( TRANS == AtlasTrans ) { ATL_zrefgemvT( M, N, ALPHA, A, LDA, X, INCX, BETA, Y, INCY ); } else { ATL_zrefgemvH( M, N, ALPHA, A, LDA, X, INCX, BETA, Y, INCY ); } /* * End of ATL_zrefgemv */ }
void ATL_zrefhbmv ( const enum ATLAS_UPLO UPLO, const int N, const int K, const double * ALPHA, const double * A, const int LDA, const double * X, const int INCX, const double * BETA, double * Y, const int INCY ) { /* * Purpose * ======= * * ATL_zrefhbmv performs the matrix-vector operation * * y := alpha * A * x + beta * y, * * where alpha and beta are scalars, x and y are n-element vectors and A * is an n by n Hermitian band matrix, with k super-diagonals. * * Arguments * ========= * * UPLO (input) const enum ATLAS_UPLO * On entry, UPLO specifies whether the upper or lower triangu- * lar part of the band matrix A is being supplied as follows: * * UPLO = AtlasUpper The upper triangular part of A is * being supplied. * * UPLO = AtlasLower The lower triangular part of A is * being supplied. * * Unchanged on exit. * * N (input) const int * On entry, N specifies the order of the matrix A. N must be at * least zero. Unchanged on exit. * * K (input) const int * On entry, K specifies the number of super-diagonals of the * matrix A. K must satisfy 0 <= K. Unchanged on exit. * * ALPHA (input) const double * * On entry, ALPHA specifies the scalar alpha. When ALPHA is * supplied as zero then A and X need not be set on input. Un- * changed on exit. * * A (input) const double * * On entry, A points to an array of size equal to or greater * than LDA * n * sizeof( double[2] ). Before entry with * UPLO = AtlasUpper, the leading ( k + 1 ) by n part of the ar- * ray A must contain the upper triangular band part of the * Hermitian matrix, supplied column by column, with the leading * diagonal of the matrix in row k of the array, the first su- * per-diagonal starting at position 1 in row k-1, and so on. * The top left k by k triangle of the array A is not referen- * ced. Unchanged on exit. * The following program segment will transfer the upper trian- * gular part of a Hermitian band matrix from conventional full * matrix storage to band storage: * * for( j = 0; j < n; j++ ) * { * m = k - j; * for( i = ( m < 0 ? -m : 0 ); i < j; i++ ) * { * a[((m+i+j*LDA)<<1)+0] = real( matrix( i, j ) ); * a[((m+i+j*LDA)<<1)+1] = imag( matrix( i, j ) ); * } * } * * Before entry with UPLO = AtlasLower, the leading ( k + 1 ) by * n part of the array A must contain the lower triangular band * part of the Hermitian matrix, supplied column by column, with * the leading diagonal of the matrix in row 0 of the array, the * first sub-diagonal starting at position 0 in row 1, and so * on. The bottom right k by k triangle of the array A is not * referenced. Unchanged on exit. * The following program segment will transfer the lower trian- * gular part of a Hermitian band matrix from conventional full * matrix storage to band storage: * * for( j = 0; j < n; j++ ) * { * i1 = ( n > j + k + 1 ? j + k + 1 : n ); * for( i = j; i < i1; i++ ) * { * a[((i-j+j*LDA)<<1)+0] = real( matrix( i, j ) ); * a[((i-j+j*LDA)<<1)+1] = imag( matrix( i, j ) ); * } * } * * Note that the imaginary parts of the local entries corres- * ponding to the diagonal elements of A need not be set and as- * sumed to be zero. Unchanged on exit. * * LDA (input) const int * On entry, LDA specifies the leading dimension of A as decla- * red in the calling (sub) program. LDA must be at least * k + 1. Unchanged on exit. * * X (input) const double * * On entry, X points to the first entry to be accessed of an * incremented array of size equal to or greater than * ( 1 + ( n - 1 ) * abs( INCX ) ) * sizeof( double[2] ), * that contains the vector x. Unchanged on exit. * * INCX (input) const int * On entry, INCX specifies the increment for the elements of X. * INCX must not be zero. Unchanged on exit. * * BETA (input) const double * * On entry, BETA specifies the scalar beta. When BETA is * supplied as zero then Y need not be set on input. Unchanged * on exit. * * Y (input/output) double * * On entry, Y points to the first entry to be accessed of an * incremented array of size equal to or greater than * ( 1 + ( n - 1 ) * abs( INCY ) ) * sizeof( double[2] ), * that contains the vector y. 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) const int * On entry, INCY specifies the increment for the elements of Y. * INCY must not be zero. Unchanged on exit. * * --------------------------------------------------------------------- */ /* .. * .. Executable Statements .. * */ if( ( N == 0 ) || ( Mdzero( ALPHA[0], ALPHA[1] ) && Mdone( BETA[0], BETA[1] ) ) ) return; if( Mdzero( ALPHA[0], ALPHA[1] ) ) { Mzvscal( N, BETA, Y, INCY ); return; } if( UPLO == AtlasUpper ) { ATL_zrefhbmvU( N, K, ALPHA, A, LDA, X, INCX, BETA, Y, INCY ); } else { ATL_zrefhbmvL( N, K, ALPHA, A, LDA, X, INCX, BETA, Y, INCY ); } /* * End of ATL_zrefhbmv */ }
void ATL_zrefhemv ( const enum ATLAS_UPLO UPLO, const int N, const double * ALPHA, const double * A, const int LDA, const double * X, const int INCX, const double * BETA, double * Y, const int INCY ) { /* * Purpose * ======= * * ATL_zrefhemv performs the matrix-vector operation * * y := alpha * A * x + beta * y, * * where alpha and beta are scalars, x and y are n-element vectors and A * is an n by n Hermitian matrix. * * Arguments * ========= * * UPLO (input) const enum ATLAS_UPLO * On entry, UPLO specifies whether the upper or lower triangu- * lar part of the array A is to be referenced as follows: * * UPLO = AtlasUpper Only the upper triangular part of A * is to be referenced. * * UPLO = AtlasLower Only the lower triangular part of A * is to be referenced. * * Unchanged on exit. * * N (input) const int * On entry, N specifies the order of the matrix A. N must be at * least zero. Unchanged on exit. * * ALPHA (input) const double * * On entry, ALPHA specifies the scalar alpha. When ALPHA is * supplied as zero then A and X need not be set on input. Un- * changed on exit. * * A (input) const double * * On entry, A points to an array of size equal to or greater * than LDA * n * sizeof( double[2] ). Before entry with * UPLO = AtlasUpper, the leading n by n upper triangular part * of the array A must contain the upper triangular part of the * Hermitian matrix and the strictly lower triangular part of * A is not referenced. Before entry with UPLO = AtlasLower, the * leading n by n lower triangular part of the array A must * contain the lower triangular part of the Hermitian matrix and * the strictly upper triangular part of A is not referenced. * Unchanged on exit. * Note that the imaginary parts of the local entries corres- * ponding to the diagonal elements of A need not be set and as- * sumed to be zero. * * LDA (input) const int * On entry, LDA specifies the leading dimension of A as decla- * red in the calling (sub) program. LDA must be at least * MAX( 1, n ). Unchanged on exit. * * X (input) const double * * On entry, X points to the first entry to be accessed of an * incremented array of size equal to or greater than * ( 1 + ( n - 1 ) * abs( INCX ) ) * sizeof( double[2] ), * that contains the vector x. Unchanged on exit. * * INCX (input) const int * On entry, INCX specifies the increment for the elements of X. * INCX must not be zero. Unchanged on exit. * * BETA (input) const double * * On entry, BETA specifies the scalar beta. When BETA is * supplied as zero then Y need not be set on input. Unchanged * on exit. * * Y (input/output) double * * On entry, Y points to the first entry to be accessed of an * incremented array of size equal to or greater than * ( 1 + ( n - 1 ) * abs( INCY ) ) * sizeof( double[2] ), * that contains the vector y. 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) const int * On entry, INCY specifies the increment for the elements of Y. * INCY must not be zero. Unchanged on exit. * * --------------------------------------------------------------------- */ /* .. * .. Executable Statements .. * */ if( ( N == 0 ) || ( Mdzero( ALPHA[0], ALPHA[1] ) && Mdone( BETA[0], BETA[1] ) ) ) return; if( Mdzero( ALPHA[0], ALPHA[1] ) ) { Mzvscal( N, BETA, Y, INCY ); return; } if( UPLO == AtlasUpper ) { ATL_zrefhemvU( N, ALPHA, A, LDA, X, INCX, BETA, Y, INCY ); } else { ATL_zrefhemvL( N, ALPHA, A, LDA, X, INCX, BETA, Y, INCY ); } /* * End of ATL_zrefhemv */ }