table of contents
other versions
- jessie 1.2.20110419-10
- jessie-backports 3.7.0-1~bpo8+1
- stretch 3.7.0-2
STRMM(3) | BLAS routine | STRMM(3) |
NAME¶
STRMM - perform one of the matrix-matrix operations B := alpha*op( A )*B, or B := alpha*B*op( A ),SYNOPSIS¶
- SUBROUTINE STRMM
- ( SIDE, UPLO, TRANSA, DIAG, M, N, ALPHA, A, LDA, B, LDB )
PURPOSE¶
STRMM performs one of the matrix-matrix operations where alpha is a scalar, B is an m by n matrix, A is a unit, or non-unit, upper or lower triangular matrix and op( A ) is one ofop( A ) = A or op( A ) = A'.
PARAMETERS¶
- SIDE - CHARACTER*1.
- On entry, SIDE specifies whether op( A ) multiplies B from the left or right as follows: SIDE = 'L' or 'l' B := alpha*op( A )*B. SIDE = 'R' or 'r' B := alpha*B*op( A ). Unchanged on exit.
- UPLO - CHARACTER*1.
- On entry, UPLO specifies whether the matrix A is an upper or lower triangular matrix as follows: UPLO = 'U' or 'u' A is an upper triangular matrix. UPLO = 'L' or 'l' A is a lower triangular matrix. Unchanged on exit. TRANSA - CHARACTER*1. On entry, TRANSA specifies the form of op( A ) to be used in the matrix multiplication as follows: TRANSA = 'N' or 'n' op( A ) = A. TRANSA = 'T' or 't' op( A ) = A'. TRANSA = 'C' or 'c' op( A ) = A'. Unchanged on exit.
- DIAG - CHARACTER*1.
- On entry, DIAG specifies whether or not A is unit triangular as follows: DIAG = 'U' or 'u' A is assumed to be unit triangular. DIAG = 'N' or 'n' A is not assumed to be unit triangular. Unchanged on exit.
- M - INTEGER.
- On entry, M specifies the number of rows of B. M must be at least zero. Unchanged on exit.
- N - INTEGER.
- On entry, N specifies the number of columns of B. N must be at least zero. Unchanged on exit.
- ALPHA - REAL .
- On entry, ALPHA specifies the scalar alpha. When alpha is zero then A is not referenced and B need not be set before entry. Unchanged on exit.
- A - REAL array of DIMENSION ( LDA, k ), where k is m
- when SIDE = 'L' or 'l' and is n when SIDE = 'R' or 'r'. Before entry with UPLO = 'U' or 'u', the leading k by k upper triangular part of the array A must contain the upper triangular matrix and the strictly lower triangular part of A is not referenced. Before entry with UPLO = 'L' or 'l', the leading k by k lower triangular part of the array A must contain the lower triangular matrix and the strictly upper triangular part of A is not referenced. Note that when DIAG = 'U' or 'u', the diagonal elements of A are not referenced either, but are assumed to be unity. Unchanged on exit.
- LDA - INTEGER.
- On entry, LDA specifies the first dimension of A as declared in the calling (sub) program. When SIDE = 'L' or 'l' then LDA must be at least max( 1, m ), when SIDE = 'R' or 'r' then LDA must be at least max( 1, n ). Unchanged on exit.
- B - REAL array of DIMENSION ( LDB, n ).
- Before entry, the leading m by n part of the array B must contain the matrix B, and on exit is overwritten by the transformed matrix.
- LDB - INTEGER.
- On entry, LDB specifies the first dimension of B as declared in the calling (sub) program. LDB must be at least max( 1, m ). Unchanged on exit. 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.
16 October 1992 | BLAS routine |