Home Man
Search
Today's Posts
Register

Linux & Unix Commands - Search Man Pages

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

CHPR(l) 				   BLAS routine 				  CHPR(l)

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

SYNOPSIS
       SUBROUTINE CHPR ( UPLO, N, ALPHA, X, INCX, AP )

	   REAL        ALPHA

	   INTEGER     INCX, N

	   CHARACTER*1 UPLO

	   COMPLEX     AP( * ), X( * )

PURPOSE
       CHPR    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, supplied in packed form.

PARAMETERS
       UPLO   - CHARACTER*1.
	      On entry, UPLO specifies whether the upper or lower triangular part of the matrix A
	      is supplied in the packed array AP as follows:

	      UPLO = 'U' or 'u'   The upper triangular part of A is supplied in AP.

	      UPLO = 'L' or 'l'   The lower triangular part of A is supplied in AP.

	      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.

       AP     - COMPLEX 	 array of DIMENSION at least
	      ( ( n*( n + 1 ) )/2 ).  Before entry with  UPLO = 'U' or 'u',  the  array  AP  must
	      contain the upper triangular part of the hermitian matrix packed sequentially, col-
	      umn by column, so that AP( 1 ) contains a( 1, 1 ), AP( 2 ) and AP( 3 )  contain  a(
	      1,  2 ) and a( 2, 2 ) respectively, and so on. On exit, the array AP is overwritten
	      by the upper triangular part of the updated matrix.  Before entry with UPLO  =  'L'
	      or 'l', the array AP must contain the lower triangular part of the hermitian matrix
	      packed sequentially, column by column, so that AP( 1 ) contains a( 1, 1 ), AP( 2	)
	      and  AP(	3 ) contain a( 2, 1 ) and a( 3, 1 ) respectively, and so on. On exit, the
	      array AP 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.

	      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				  CHPR(l)


All times are GMT -4. The time now is 07:32 PM.

Unix & Linux Forums Content Copyrightę1993-2018. All Rights Reserved.
UNIX.COM Login
Username:
Password:  
Show Password