chemv.f man page

chemv.f —

Synopsis

Functions/Subroutines

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

Function/Subroutine 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.

Referenced By

chemv(3) is an alias of chemv.f(3).

Sat Nov 16 2013 Version 3.4.2 LAPACK