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ZGEMM(3) | BLAS routine | ZGEMM(3) |
NAME¶
ZGEMM - perform one of the matrix-matrix operations C := alpha*op( A )*op( B ) + beta*C,SYNOPSIS¶
- SUBROUTINE ZGEMM
- ( TRANSA, TRANSB, M, N, K, ALPHA, A, LDA, B, LDB, BETA, C, LDC )
- CHARACTER*1
- TRANSA, TRANSB
- INTEGER
- M, N, K, LDA, LDB, LDC
- COMPLEX*16
- ALPHA, BETA
- COMPLEX*16
- A( LDA, * ), B( LDB, * ), C( LDC, * )
PURPOSE¶
ZGEMM performs one of the matrix-matrix operationsop( X ) = X or op( X ) = X' or op( X ) = conjg( X' ),
PARAMETERS¶
TRANSA - CHARACTER*1. On entry, TRANSA specifies the form of op( A ) to be used in the matrix multiplication as follows:- M - INTEGER.
- On entry, M specifies the number of rows of the matrix op( A ) and of the matrix C. M must be at least zero. Unchanged on exit.
- N - INTEGER.
- On entry, N specifies the number of columns of the matrix op( B ) and the number of columns of the matrix C. N must be at least zero. Unchanged on exit.
- K - INTEGER.
- On entry, K specifies the number of columns of the matrix op( A ) and the number of rows of the matrix op( B ). K must be at least zero. Unchanged on exit.
- ALPHA - COMPLEX*16 .
- On entry, ALPHA specifies the scalar alpha. Unchanged on exit.
- A - COMPLEX*16 array of DIMENSION ( LDA, ka ), where ka is
- k when TRANSA = 'N' or 'n', and is m otherwise. Before entry with TRANSA = 'N' or 'n', the leading m by k part of the array A must contain the matrix A, otherwise the leading k by m 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 TRANSA = 'N' or 'n' then LDA must be at least max( 1, m ), otherwise LDA must be at least max( 1, k ). Unchanged on exit.
- B - COMPLEX*16 array of DIMENSION ( LDB, kb ), where kb is
- n when TRANSB = 'N' or 'n', and is k otherwise. Before entry with TRANSB = 'N' or 'n', the leading k by n part of the array B must contain the matrix B, otherwise the leading n by k part of the array B must contain the matrix B. Unchanged on exit.
- LDB - INTEGER.
- On entry, LDB specifies the first dimension of B as declared in the calling (sub) program. When TRANSB = 'N' or 'n' then LDB must be at least max( 1, k ), otherwise LDB must be at least max( 1, n ). Unchanged on exit.
- BETA - COMPLEX*16 .
- On entry, BETA specifies the scalar beta. When BETA is supplied as zero then C need not be set on input. Unchanged on exit.
- C - COMPLEX*16 array of DIMENSION ( LDC, n ).
- Before entry, the leading 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 matrix ( alpha*op( A )*op( B ) + beta*C ).
- 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, m ).
Unchanged on exit.
16 October 1992 | BLAS routine |