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MAN page from OpenSuSE blas-man-3.4.2-3.6.2.x86_64.rpm

chemv.f

Section: LAPACK (3)
Updated: Thu Jun 23 2016
Index 

NAME

chemv.f -  

SYNOPSIS


 

Functions/Subroutines


subroutine CHEMV (UPLO, N, ALPHA, A, LDA, X, INCX, BETA, Y, INCY)
CHEMV  

Function Documentation

 

subroutine CHEMV (CHARACTERUPLO, INTEGERN, COMPLEXALPHA, COMPLEX,dimension(lda,*)A, INTEGERLDA, COMPLEX,dimension(*)X, INTEGERINCX, COMPLEXBETA, COMPLEX,dimension(*)Y, INTEGERINCY)

CHEMV Purpose:

 CHEMV  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. 


 

Parameters:

UPLO

          UPLO is 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. 


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. 


A

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


LDA

          LDA is 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 ). 


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 155 of file chemv.f. 

Author

Generated automatically by Doxygen for LAPACK from the source code.


 

Index

NAME
SYNOPSIS
Functions/Subroutines
Function Documentation
subroutine CHEMV (CHARACTERUPLO, INTEGERN, COMPLEXALPHA, COMPLEX,dimension(lda,*)A, INTEGERLDA, COMPLEX,dimension(*)X, INTEGERINCX, COMPLEXBETA, COMPLEX,dimension(*)Y, INTEGERINCY)
Author

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