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RedHat 9 (Linux i386) - man page for cher2 (redhat section l)

CHER2(l)				   BLAS routine 				 CHER2(l)

NAME
       CHER2  -  perform the hermitian rank 2 operation   A := alpha*x*conjg( y' ) + conjg( alpha
       )*y*conjg( x' ) + A,

SYNOPSIS
       SUBROUTINE CHER2 ( UPLO, N, ALPHA, X, INCX, Y, INCY, A, LDA )

	   COMPLEX	ALPHA

	   INTEGER	INCX, INCY, LDA, N

	   CHARACTER*1	UPLO

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

PURPOSE
       CHER2  performs the hermitian rank 2 operation

       where alpha is a scalar, x and y are n element vectors and  A  is  an  n  by  n	hermitian
       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  - COMPLEX 	.
	      On entry, ALPHA specifies the scalar alpha.  Unchanged on exit.

       X      - COMPLEX 	 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.

       Y      - COMPLEX 	 array of dimension at least
	      (  1 + ( n - 1 )*abs( INCY ) ).  Before entry, the incremented array Y must contain
	      the n element vector y.  Unchanged on exit.

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

       A      - COMPLEX 	 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 hermitian 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 hermitian  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.  Note that the imaginary parts of the diagonal elements need not be
	      set, they are assumed to be zero, and on exit they are set to zero.

       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				 CHER2(l)


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