strmm.f man page

strmm.f —

Synopsis

Functions/Subroutines

subroutine strmm (SIDE, UPLO, TRANSA, DIAG, M, N, ALPHA, A, LDA, B, LDB)
STRMM

Function/Subroutine Documentation

subroutine strmm (characterSIDE, characterUPLO, characterTRANSA, characterDIAG, integerM, integerN, realALPHA, real, dimension(lda,*)A, integerLDA, real, dimension(ldb,*)B, integerLDB)

STRMM Purpose:

STRMM  performs one of the matrix-matrix operations

   B := alpha*op( A )*B,   or   B := alpha*B*op( A ),

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  of

   op( A ) = A   or   op( A ) = A**T.

Parameters:

SIDE

SIDE is 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 ).

UPLO

UPLO is 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.

TRANSA

TRANSA is 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**T.

    TRANSA = 'C' or 'c'   op( A ) = A**T.

DIAG

DIAG is 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.

M

M is INTEGER
 On entry, M specifies the number of rows of B. M must be at
 least zero.

N

N is INTEGER
 On entry, N specifies the number of columns of B.  N must be
 at least zero.

ALPHA

ALPHA is 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.

A

A is 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.

LDA

LDA is 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 ).

B

B is 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

LDB is 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 ).

Author:

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Date:

November 2011

Further Details:

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.

Definition at line 178 of file strmm.f.

Author

Generated automatically by Doxygen for LAPACK from the source code.

Referenced By

strmm(3) is an alias of strmm.f(3).

Sat Nov 16 2013 Version 3.4.2 LAPACK