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RedHat 9 (Linux i386) - man page for dtrmm (redhat section l)

DTRMM(l)				   BLAS routine 				 DTRMM(l)

NAME
       DTRMM  -  perform  one  of  the	matrix-matrix  operations   B := alpha*op( A )*B, or B :=
       alpha*B*op( A ),

SYNOPSIS
       SUBROUTINE DTRMM ( SIDE, UPLO, TRANSA, DIAG, M, N, ALPHA, A, LDA, B, LDB )

	   CHARACTER*1	SIDE, UPLO, TRANSA, DIAG

	   INTEGER	M, N, LDA, LDB

	   DOUBLE	PRECISION ALPHA

	   DOUBLE	PRECISION A( LDA, * ), B( LDB, * )

PURPOSE
       DTRMM  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  of

	  op( 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  - DOUBLE PRECISION.
	      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      - DOUBLE PRECISION 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      - DOUBLE PRECISION 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 Hammar-
	      ling, Numerical Algorithms Group Ltd.

BLAS routine				 16 October 1992				 DTRMM(l)


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