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

SSYR(l) 				   BLAS routine 				  SSYR(l)

NAME
       SSYR - perform the symmetric rank 1 operation   A := alpha*x*x' + A,

SYNOPSIS
       SUBROUTINE SSYR ( UPLO, N, ALPHA, X, INCX, A, LDA )

	   REAL        ALPHA

	   INTEGER     INCX, LDA, N

	   CHARACTER*1 UPLO

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

PURPOSE
       SSYR   performs the symmetric rank 1 operation

       where  alpha  is  a  real  scalar,  x  is an n element vector and A is an n by n symmetric
       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.

       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.

       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. On exit, the upper  triangu-
	      lar  part of the array A is overwritten by the upper triangular part of the updated
	      matrix.  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. On exit,  the  lower
	      triangular  part	of the array A is overwritten by the lower triangular part of the
	      updated matrix.

       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.

	      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				  SSYR(l)


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