diff options
Diffstat (limited to 'BLAS/SRC/zherk.f')
| -rw-r--r-- | BLAS/SRC/zherk.f | 290 |
1 files changed, 182 insertions, 108 deletions
diff --git a/BLAS/SRC/zherk.f b/BLAS/SRC/zherk.f index af04413a..f1795c40 100644 --- a/BLAS/SRC/zherk.f +++ b/BLAS/SRC/zherk.f @@ -1,125 +1,199 @@ - SUBROUTINE ZHERK(UPLO,TRANS,N,K,ALPHA,A,LDA,BETA,C,LDC) -* .. Scalar Arguments .. - DOUBLE PRECISION ALPHA,BETA - INTEGER K,LDA,LDC,N - CHARACTER TRANS,UPLO -* .. -* .. Array Arguments .. - COMPLEX*16 A(LDA,*),C(LDC,*) -* .. +*> \brief \b ZHERK +* +* =========== DOCUMENTATION =========== * +* Online html documentation available at +* http://www.netlib.org/lapack/explore-html/ +* +* Definition +* ========== +* +* SUBROUTINE ZHERK(UPLO,TRANS,N,K,ALPHA,A,LDA,BETA,C,LDC) +* +* .. Scalar Arguments .. +* DOUBLE PRECISION ALPHA,BETA +* INTEGER K,LDA,LDC,N +* CHARACTER TRANS,UPLO +* .. +* .. Array Arguments .. +* COMPLEX*16 A(LDA,*),C(LDC,*) +* .. +* * Purpose * ======= * -* ZHERK performs one of the hermitian rank k operations -* -* C := alpha*A*A**H + beta*C, +*>\details \b Purpose: +*>\verbatim +*> +*> ZHERK performs one of the hermitian rank k operations +*> +*> C := alpha*A*A**H + beta*C, +*> +*> or +*> +*> C := alpha*A**H*A + beta*C, +*> +*> where alpha and beta are real scalars, C is an n by n hermitian +*> matrix and A is an n by k matrix in the first case and a k by n +*> matrix in the second case. +*> +*>\endverbatim * -* or +* Arguments +* ========= +* +*> \param[in] UPLO +*> \verbatim +*> UPLO is CHARACTER*1 +*> On entry, UPLO specifies whether the upper or lower +*> triangular part of the array C is to be referenced as +*> follows: +*> \endverbatim +*> \verbatim +*> UPLO = 'U' or 'u' Only the upper triangular part of C +*> is to be referenced. +*> \endverbatim +*> \verbatim +*> UPLO = 'L' or 'l' Only the lower triangular part of C +*> is to be referenced. +*> \endverbatim +*> +*> \param[in] TRANS +*> \verbatim +*> TRANS is CHARACTER*1 +*> On entry, TRANS specifies the operation to be performed as +*> follows: +*> \endverbatim +*> \verbatim +*> TRANS = 'N' or 'n' C := alpha*A*A**H + beta*C. +*> \endverbatim +*> \verbatim +*> TRANS = 'C' or 'c' C := alpha*A**H*A + beta*C. +*> \endverbatim +*> +*> \param[in] N +*> \verbatim +*> N is INTEGER +*> On entry, N specifies the order of the matrix C. N must be +*> at least zero. +*> \endverbatim +*> +*> \param[in] K +*> \verbatim +*> K is INTEGER +*> On entry with TRANS = 'N' or 'n', K specifies the number +*> of columns of the matrix A, and on entry with +*> TRANS = 'C' or 'c', K specifies the number of rows of the +*> matrix A. K must be at least zero. +*> \endverbatim +*> +*> \param[in] ALPHA +*> \verbatim +*> ALPHA is DOUBLE PRECISION . +*> On entry, ALPHA specifies the scalar alpha. +*> \endverbatim +*> +*> \param[in] A +*> \verbatim +*> A is COMPLEX*16 array of DIMENSION ( LDA, ka ), where ka is +*> k when TRANS = 'N' or 'n', and is n otherwise. +*> Before entry with TRANS = 'N' or 'n', the leading n by k +*> part of the array A must contain the matrix A, otherwise +*> the leading k by n part of the array A must contain the +*> matrix A. +*> \endverbatim +*> +*> \param[in] LDA +*> \verbatim +*> LDA is INTEGER +*> On entry, LDA specifies the first dimension of A as declared +*> in the calling (sub) program. When TRANS = 'N' or 'n' +*> then LDA must be at least max( 1, n ), otherwise LDA must +*> be at least max( 1, k ). +*> \endverbatim +*> +*> \param[in] BETA +*> \verbatim +*> BETA is DOUBLE PRECISION. +*> On entry, BETA specifies the scalar beta. +*> \endverbatim +*> +*> \param[in,out] C +*> \verbatim +*> C is COMPLEX*16 array of DIMENSION ( LDC, n ). +*> Before entry with UPLO = 'U' or 'u', the leading n by n +*> upper triangular part of the array C must contain the upper +*> triangular part of the hermitian matrix and the strictly +*> lower triangular part of C is not referenced. On exit, the +*> upper triangular part of the array C is overwritten by the +*> upper triangular part of the updated matrix. +*> Before entry with UPLO = 'L' or 'l', the leading n by n +*> lower triangular part of the array C must contain the lower +*> triangular part of the hermitian matrix and the strictly +*> upper triangular part of C is not referenced. On exit, the +*> lower triangular part of the array C is overwritten by the +*> lower triangular part of the updated matrix. +*> Note that the imaginary parts of the diagonal elements need +*> not be set, they are assumed to be zero, and on exit they +*> are set to zero. +*> \endverbatim +*> +*> \param[in] LDC +*> \verbatim +*> LDC is INTEGER +*> On entry, LDC specifies the first dimension of C as declared +*> in the calling (sub) program. LDC must be at least +*> max( 1, n ). +*> \endverbatim +*> +* +* Authors +* ======= * -* C := alpha*A**H*A + beta*C, +*> \author Univ. of Tennessee +*> \author Univ. of California Berkeley +*> \author Univ. of Colorado Denver +*> \author NAG Ltd. * -* where alpha and beta are real scalars, C is an n by n hermitian -* matrix and A is an n by k matrix in the first case and a k by n -* matrix in the second case. +*> \date November 2011 * -* Arguments -* ========== +*> \ingroup complex16_blas_level3 * -* UPLO - CHARACTER*1. -* On entry, UPLO specifies whether the upper or lower -* triangular part of the array C is to be referenced as -* follows: -* -* UPLO = 'U' or 'u' Only the upper triangular part of C -* is to be referenced. -* -* UPLO = 'L' or 'l' Only the lower triangular part of C -* is to be referenced. -* -* Unchanged on exit. -* -* TRANS - CHARACTER*1. -* On entry, TRANS specifies the operation to be performed as -* follows: -* -* TRANS = 'N' or 'n' C := alpha*A*A**H + beta*C. -* -* TRANS = 'C' or 'c' C := alpha*A**H*A + beta*C. -* -* Unchanged on exit. -* -* N - INTEGER. -* On entry, N specifies the order of the matrix C. N must be -* at least zero. -* Unchanged on exit. -* -* K - INTEGER. -* On entry with TRANS = 'N' or 'n', K specifies the number -* of columns of the matrix A, and on entry with -* TRANS = 'C' or 'c', K specifies the number of rows of the -* matrix A. K must be at least zero. -* Unchanged on exit. -* -* ALPHA - DOUBLE PRECISION . -* On entry, ALPHA specifies the scalar alpha. -* Unchanged on exit. -* -* A - COMPLEX*16 array of DIMENSION ( LDA, ka ), where ka is -* k when TRANS = 'N' or 'n', and is n otherwise. -* Before entry with TRANS = 'N' or 'n', the leading n by k -* part of the array A must contain the matrix A, otherwise -* the leading k by n part of the array A must contain the -* matrix A. -* Unchanged on exit. -* -* LDA - INTEGER. -* On entry, LDA specifies the first dimension of A as declared -* in the calling (sub) program. When TRANS = 'N' or 'n' -* then LDA must be at least max( 1, n ), otherwise LDA must -* be at least max( 1, k ). -* Unchanged on exit. -* -* BETA - DOUBLE PRECISION. -* On entry, BETA specifies the scalar beta. -* Unchanged on exit. -* -* C - COMPLEX*16 array of DIMENSION ( LDC, n ). -* Before entry with UPLO = 'U' or 'u', the leading n by n -* upper triangular part of the array C must contain the upper -* triangular part of the hermitian matrix and the strictly -* lower triangular part of C is not referenced. On exit, the -* upper triangular part of the array C is overwritten by the -* upper triangular part of the updated matrix. -* Before entry with UPLO = 'L' or 'l', the leading n by n -* lower triangular part of the array C must contain the lower -* triangular part of the hermitian matrix and the strictly -* upper triangular part of C is not referenced. On exit, the -* lower triangular part of the array C is overwritten by the -* lower triangular part of the updated matrix. -* Note that the imaginary parts of the diagonal elements need -* not be set, they are assumed to be zero, and on exit they -* are set to zero. -* -* LDC - INTEGER. -* On entry, LDC specifies the first dimension of C as declared -* in the calling (sub) program. LDC must be at least -* max( 1, n ). -* Unchanged on exit. * * Further Details * =============== +*>\details \b Further \b Details +*> \verbatim +*> +*> Level 3 Blas routine. +*> +*> -- Written on 8-February-1989. +*> Jack Dongarra, Argonne National Laboratory. +*> Iain Duff, AERE Harwell. +*> Jeremy Du Croz, Numerical Algorithms Group Ltd. +*> Sven Hammarling, Numerical Algorithms Group Ltd. +*> +*> -- Modified 8-Nov-93 to set C(J,J) to DBLE( C(J,J) ) when BETA = 1. +*> Ed Anderson, Cray Research Inc. +*> +*> \endverbatim +*> +* ===================================================================== + SUBROUTINE ZHERK(UPLO,TRANS,N,K,ALPHA,A,LDA,BETA,C,LDC) * -* Level 3 Blas routine. -* -* -- Written on 8-February-1989. -* Jack Dongarra, Argonne National Laboratory. -* Iain Duff, AERE Harwell. -* Jeremy Du Croz, Numerical Algorithms Group Ltd. -* Sven Hammarling, Numerical Algorithms Group Ltd. +* -- Reference BLAS level3 routine (version 3.4.0) -- +* -- Reference BLAS is a software package provided by Univ. of Tennessee, -- +* -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..-- +* November 2011 * -* -- Modified 8-Nov-93 to set C(J,J) to DBLE( C(J,J) ) when BETA = 1. -* Ed Anderson, Cray Research Inc. +* .. Scalar Arguments .. + DOUBLE PRECISION ALPHA,BETA + INTEGER K,LDA,LDC,N + CHARACTER TRANS,UPLO +* .. +* .. Array Arguments .. + COMPLEX*16 A(LDA,*),C(LDC,*) +* .. * * ===================================================================== * |