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

CSYR(l) 					)					  CSYR(l)

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

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

	   CHARACTER	UPLO

	   INTEGER	INCX, LDA, N

	   COMPLEX	ALPHA

	   COMPLEX	A( LDA, * ), X( * )

PURPOSE
       CSYR  performs  the  symmetric  rank 1 operation A := alpha*x*( x' ) + A, where alpha is a
       complex scalar, x is an n element vector and A is an n by n symmetric matrix.

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

       X      - COMPLEX array, 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      - COMPLEX array, 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.

LAPACK version 3.0			   15 June 2000 				  CSYR(l)


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