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

CHER(l) 				   BLAS routine 				  CHER(l)

NAME
       CHER - perform the hermitian rank 1 operation   A := alpha*x*conjg( x' ) + A,

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

	   REAL        ALPHA

	   INTEGER     INCX, LDA, N

	   CHARACTER*1 UPLO

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

PURPOSE
       CHER   performs the hermitian rank 1 operation

       where  alpha  is  a  real  scalar,  x  is an n element vector 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  - REAL		.
	      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.

       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				  CHER(l)


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