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MAN page from openSUSE Leap 42 blas-man-3.4.2-3.6.1.noarch.rpm

chpmv.f

Section: LAPACK (3)
Updated: Wed Oct 17 2018
Index 

NAME

chpmv.f -  

SYNOPSIS


 

Functions/Subroutines


subroutine CHPMV (UPLO, N, ALPHA, AP, X, INCX, BETA, Y, INCY)
CHPMV  

Function/Subroutine Documentation

 

subroutine CHPMV (characterUPLO, integerN, complexALPHA, complex, dimension(*)AP, complex, dimension(*)X, integerINCX, complexBETA, complex, dimension(*)Y, integerINCY)

CHPMV Purpose:

 CHPMV  performs the matrix-vector operation    y := alpha*A*x + beta*y, where alpha and beta are scalars, x and y are n element vectors and A is an n by n hermitian matrix, supplied in packed form.


 

Parameters:

UPLO

          UPLO is 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.


N

          N is INTEGER           On entry, N specifies the order of the matrix A.           N must be at least zero.


ALPHA

          ALPHA is COMPLEX           On entry, ALPHA specifies the scalar alpha.


AP

          AP is 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, column 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.           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.           Note that the imaginary parts of the diagonal elements need           not be set and are assumed to be zero.


X

          X is COMPLEX array of dimension at least           ( 1 + ( n - 1 )*abs( INCX ) ).           Before entry, the incremented array X must contain the n           element vector x.


INCX

          INCX is INTEGER           On entry, INCX specifies the increment for the elements of           X. INCX must not be zero.


BETA

          BETA is COMPLEX           On entry, BETA specifies the scalar beta. When BETA is           supplied as zero then Y need not be set on input.


Y

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


INCY

          INCY is INTEGER           On entry, INCY specifies the increment for the elements of           Y. INCY must not be zero.


 

Author:

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Date:

November 2011

Further Details:

  Level 2 Blas routine.  The vector and matrix arguments are not referenced when N = 0, or M = 0  -- 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.


 

Definition at line 150 of file chpmv.f. 

Author

Generated automatically by Doxygen for LAPACK from the source code.


 

Index

NAME
SYNOPSIS
Functions/Subroutines
Function/Subroutine Documentation
subroutine CHPMV (characterUPLO, integerN, complexALPHA, complex, dimension(*)AP, complex, dimension(*)X, integerINCX, complexBETA, complex, dimension(*)Y, integerINCY)
Author

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