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

SSYMV(l)				   BLAS routine 				 SSYMV(l)

NAME
       SSYMV - perform the matrix-vector operation   y := alpha*A*x + beta*y,

SYNOPSIS
       SUBROUTINE SSYMV ( UPLO, N, ALPHA, A, LDA, X, INCX, BETA, Y, INCY )

	   REAL 	ALPHA, BETA

	   INTEGER	INCX, INCY, LDA, N

	   CHARACTER*1	UPLO

	   REAL 	A( LDA, * ), X( * ), Y( * )

PURPOSE
       SSYMV  performs the matrix-vector  operation

       where alpha and beta are scalars, x and y are n element vectors and A is an n by n symmet-
       ric matrix.

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

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

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

	      Unchanged on exit.

       N      - INTEGER.
	      On  entry,  N  specifies	the  order  of	the  matrix  A.  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, n ).
	      Before entry with  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.  Before entry  with  UPLO	=
	      'L'  or  'l',  the leading n by n lower triangular part of the array A must contain
	      the lower triangular 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. LDA must be at least max( 1, n ).  Unchanged on exit.

       X      - REAL		 array of dimension at least
	      ( 1 + ( n - 1 )*abs( INCX ) ).  Before entry, the incremented array X must  contain
	      the n element vector x.  Unchanged on exit.

       INCX   - INTEGER.
	      On  entry,  INCX	specifies  the	increment for the elements of X. INCX must not be
	      zero.  Unchanged on exit.

       BETA   - REAL		.
	      On entry, BETA specifies the scalar beta. When BETA is supplied as zero then Y need
	      not be set on input.  Unchanged on exit.

       Y      - REAL		 array of dimension at least
	      (  1 + ( n - 1 )*abs( INCY ) ).  Before entry, the incremented array Y must contain
	      the n element vector y. On exit, Y is overwritten by the updated vector y.

       INCY   - INTEGER.
	      On entry, INCY specifies the increment for the elements of  Y.  INCY  must  not  be
	      zero.  Unchanged on exit.

	      Level 2 Blas routine.

	      --  Written  on  22-October-1986.   Jack Dongarra, Argonne National Lab.	Jeremy Du
	      Croz, Nag Central Office.  Sven Hammarling, Nag Central  Office.	 Richard  Hanson,
	      Sandia National Labs.

BLAS routine				 16 October 1992				 SSYMV(l)


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