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# cgemv.f

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

cgemv.f -

## SYNOPSIS

### Functions/Subroutines

subroutine CGEMV (TRANS, M, N, ALPHA, A, LDA, X, INCX, BETA, Y, INCY)
CGEMV

## Function/Subroutine Documentation

### subroutine CGEMV (characterTRANS, integerM, integerN, complexALPHA, complex, dimension(lda,*)A, integerLDA, complex, dimension(*)X, integerINCX, complexBETA, complex, dimension(*)Y, integerINCY)

CGEMV Purpose:

` CGEMV performs one of the matrix-vector operations    y := alpha*A*x + beta*y,   or   y := alpha*A**T*x + beta*y,   or    y := alpha*A**H*x + beta*y, where alpha and beta are scalars, x and y are vectors and A is an m by n matrix.`

Parameters:

TRANS

`          TRANS is CHARACTER*1           On entry, TRANS specifies the operation to be performed as           follows:              TRANS = 'N' or 'n'   y := alpha*A*x + beta*y.              TRANS = 'T' or 't'   y := alpha*A**T*x + beta*y.              TRANS = 'C' or 'c'   y := alpha*A**H*x + beta*y.`

M

`          M is INTEGER           On entry, M specifies the number of rows of the matrix A.           M must be at least zero.`

N

`          N is INTEGER           On entry, N specifies the number of columns 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, the leading m by n part of the array A must           contain the matrix of coefficients.`

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, m ).`

X

`          X is COMPLEX array of DIMENSION at least           ( 1 + ( n - 1 )*abs( INCX ) ) when TRANS = 'N' or 'n'           and at least           ( 1 + ( m - 1 )*abs( INCX ) ) otherwise.           Before entry, the incremented array X must contain the           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 + ( m - 1 )*abs( INCY ) ) when TRANS = 'N' or 'n'           and at least           ( 1 + ( n - 1 )*abs( INCY ) ) otherwise.           Before entry with BETA non-zero, the incremented array Y           must contain the 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

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 159 of file cgemv.f.

## Author

Generated automatically by Doxygen for LAPACK from the source code.

## Index

NAME
SYNOPSIS
Functions/Subroutines
Function/Subroutine Documentation
subroutine CGEMV (characterTRANS, integerM, integerN, complexALPHA, complex, dimension(lda,*)A, integerLDA, complex, dimension(*)X, integerINCX, complexBETA, complex, dimension(*)Y, integerINCY)
Author

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