cgemv(3P) Sun Performance Library cgemv(3P)NAMEcgemv - perform one of the matrix-vector operations y := alpha*A*x +
beta*y, or y := alpha*A'*x + beta*y, or y := alpha*conjg( A' )*x +
beta*y
SYNOPSIS
SUBROUTINE CGEMV(TRANSA, M, N, ALPHA, A, LDA, X, INCX, BETA, Y, INCY)
CHARACTER * 1 TRANSA
COMPLEX ALPHA, BETA
COMPLEX A(LDA,*), X(*), Y(*)
INTEGER M, N, LDA, INCX, INCY
SUBROUTINE CGEMV_64(TRANSA, M, N, ALPHA, A, LDA, X, INCX, BETA, Y,
INCY)
CHARACTER * 1 TRANSA
COMPLEX ALPHA, BETA
COMPLEX A(LDA,*), X(*), Y(*)
INTEGER*8 M, N, LDA, INCX, INCY
F95 INTERFACE
SUBROUTINE GEMV([TRANSA], [M], [N], ALPHA, A, [LDA], X, [INCX], BETA,
Y, [INCY])
CHARACTER(LEN=1) :: TRANSA
COMPLEX :: ALPHA, BETA
COMPLEX, DIMENSION(:) :: X, Y
COMPLEX, DIMENSION(:,:) :: A
INTEGER :: M, N, LDA, INCX, INCY
SUBROUTINE GEMV_64([TRANSA], [M], [N], ALPHA, A, [LDA], X, [INCX],
BETA, Y, [INCY])
CHARACTER(LEN=1) :: TRANSA
COMPLEX :: ALPHA, BETA
COMPLEX, DIMENSION(:) :: X, Y
COMPLEX, DIMENSION(:,:) :: A
INTEGER(8) :: M, N, LDA, INCX, INCY
C INTERFACE
#include <sunperf.h>
void cgemv(char transa, int m, int n, complex *alpha, complex *a, int
lda, complex *x, int incx, complex *beta, complex *y, int
incy);
void cgemv_64(char transa, long m, long n, complex *alpha, complex *a,
long lda, complex *x, long incx, complex *beta, complex *y,
long incy);
PURPOSEcgemv performs one of the matrix-vector operations y := alpha*A*x +
beta*y, or y := alpha*A'*x + beta*y, or y := alpha*conjg( A' )*x +
beta*y where alpha and beta are scalars, x and y are vectors and A is
an m by n matrix.
ARGUMENTS
TRANSA (input)
On entry, TRANSA specifies the operation to be performed as
follows:
TRANSA = 'N' or 'n' y := alpha*A*x + beta*y.
TRANSA = 'T' or 't' y := alpha*A'*x + beta*y.
TRANSA = 'C' or 'c' y := alpha*conjg( A' )*x + beta*y.
Unchanged on exit.
TRANSA is defaulted to 'N' for F95 INTERFACE.
M (input)
On entry, M specifies the number of rows of the matrix A. M
>= 0. Unchanged on exit.
N (input)
On entry, N specifies the number of columns of the matrix A.
N >= 0. Unchanged on exit.
ALPHA (input)
On entry, ALPHA specifies the scalar alpha. Unchanged on
exit.
A (input)
Before entry, the leading m by n part of the array A must
contain the matrix of coefficients. Unchanged on exit.
LDA (input)
On entry, LDA specifies the first dimension of A as declared
in the calling (sub) program. LDA >= max( 1, m ). Unchanged
on exit.
X (input)
( 1 + ( n - 1 )*abs( INCX ) ) when TRANSA = 'N' or 'n' and at
least ( 1 + ( m - 1 )*abs( INCX ) ) otherwise. Before entry,
the incremented array X must contain the vector x. Unchanged
on exit.
INCX (input)
On entry, INCX specifies the increment for the elements of X.
INCX must not be zero. Unchanged on exit.
BETA (input)
On entry, BETA specifies the scalar beta. When BETA is sup‐
plied as zero then Y need not be set on input. Unchanged on
exit.
Y (input/output)
( 1 + ( m - 1 )*abs( INCY ) ) when TRANSA = '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 (input)
On entry, INCY specifies the increment for the elements of Y.
INCY must not be zero. Unchanged on exit.
6 Mar 2009 cgemv(3P)
