👤
Home Man
Search
Today's Posts
Register

Linux & Unix Commands - Search Man Pages
Man Page or Keyword Search:
Select Section of Man Page:
Select Man Page Repository:

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

DSPR(l) 				   BLAS routine 				  DSPR(l)

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

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

	   DOUBLE      PRECISION ALPHA

	   INTEGER     INCX, N

	   CHARACTER*1 UPLO

	   DOUBLE      PRECISION AP( * ), X( * )

PURPOSE
       DSPR    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, 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  - 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.

       AP     - DOUBLE PRECISION 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 symmetric 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 symmetric 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.

	      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				  DSPR(l)


All times are GMT -4. The time now is 08:38 PM.

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