dsyr man page on YellowDog

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DSYR(l)				 BLAS routine			       DSYR(l)

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

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

	   DOUBLE      PRECISION ALPHA

	   INTEGER     INCX, LDA, N

	   CHARACTER*1 UPLO

	   DOUBLE      PRECISION A( LDA, * ), X( * )

PURPOSE
       DSYR   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  - DOUBLE PRECISION.
	      On entry, ALPHA specifies the scalar alpha.  Unchanged on exit.

       X      - DOUBLE PRECISION 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      - DOUBLE PRECISION 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 triangular 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			       DSYR(l)
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