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

SSYMM(l)				   BLAS routine 				 SSYMM(l)

NAME
       SSYMM - perform one of the matrix-matrix operations   C := alpha*A*B + beta*C,

SYNOPSIS
       SUBROUTINE SSYMM ( SIDE, UPLO, M, N, ALPHA, A, LDA, B, LDB, BETA, C, LDC )

	   CHARACTER*1	SIDE, UPLO

	   INTEGER	M, N, LDA, LDB, LDC

	   REAL 	ALPHA, BETA

	   REAL 	A( LDA, * ), B( LDB, * ), C( LDC, * )

PURPOSE
       SSYMM  performs one of the matrix-matrix operations

       or

	  C := alpha*B*A + beta*C,

       where alpha and beta are scalars,  A is a symmetric matrix and  B and C are  m by n matri-
       ces.

PARAMETERS
       SIDE   - CHARACTER*1.
	      On entry,  SIDE  specifies whether  the  symmetric matrix  A appears on  the   left
	      or right	in the	operation as follows:

	      SIDE = 'L' or 'l'   C := alpha*A*B + beta*C,

	      SIDE = 'R' or 'r'   C := alpha*B*A + beta*C,

	      Unchanged on exit.

       UPLO   - CHARACTER*1.
	      On   entry,    UPLO  specifies  whether  the  upper  or  lower triangular  part  of
	      the  symmetric  matrix   A  is  to  be referenced as follows:

	      UPLO = 'U' or 'u'   Only the upper triangular part of the symmetric matrix is to be
	      referenced.

	      UPLO = 'L' or 'l'   Only the lower triangular part of the symmetric matrix is to be
	      referenced.

	      Unchanged on exit.

       M      - INTEGER.
	      On entry,  M  specifies the number of rows 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 C.  N  must be at least
	      zero.  Unchanged on exit.

       ALPHA  - REAL		.
	      On entry, ALPHA specifies the scalar alpha.  Unchanged on exit.

       A      - REAL		 array of DIMENSION ( LDA, ka ), where ka is
	      m  when  SIDE = 'L' or 'l'  and is  n otherwise.	Before entry  with  SIDE = 'L' or
	      'l',   the  m by m  part of the array  A	must contain the  symmetric matrix,  such
	      that when  UPLO = 'U' or 'u', the leading m by m upper triangular part of the array
	      A   must	contain  the  upper  triangular  part  of  the	 symmetric matrix and the
	      strictly	lower triangular part of  A  is not referenced,  and when  UPLO = 'L'  or
	      'l',  the  leading   m  by m  lower triangular part  of the  array  A must  contain
	      the  lower triangular part  of the  symmetric matrix and the  strictly upper trian-
	      gular  part  of  A  is not referenced.  Before entry  with  SIDE = 'R' or 'r',  the
	      n by n  part of the array  A  must contain the  symmetric matrix,  such  that  when
	      UPLO  =  'U' or 'u', the leading n by n upper triangular part of the array  A  must
	      contain the upper triangular part of the	symmetric matrix and the  strictly  lower
	      triangular part of  A  is not referenced,  and when  UPLO = 'L' or 'l', the leading
	      n by n  lower triangular part  of the  array  A must  contain  the  lower  triangu-
	      lar  part   of  the  symmetric matrix and the  strictly upper triangular part of	A
	      is not referenced.  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 ), other-
	      wise  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.
	      Unchanged on exit.

       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.

       BETA   - REAL		.
	      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      - REAL		 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 updated matrix.

       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.

	      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				 SSYMM(l)


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