Contents
dgemv - perform one of the matrix-vector operations y :=
alpha*A*x + beta*y or y := alpha*A'*x + beta*y
SUBROUTINE DGEMV(TRANSA, M, N, ALPHA, A, LDA, X, INCX, BETA, Y, INCY)
CHARACTER * 1 TRANSA
INTEGER M, N, LDA, INCX, INCY
DOUBLE PRECISION ALPHA, BETA
DOUBLE PRECISION A(LDA,*), X(*), Y(*)
SUBROUTINE DGEMV_64(TRANSA, M, N, ALPHA, A, LDA, X, INCX, BETA, Y,
INCY)
CHARACTER * 1 TRANSA
INTEGER*8 M, N, LDA, INCX, INCY
DOUBLE PRECISION ALPHA, BETA
DOUBLE PRECISION A(LDA,*), X(*), Y(*)
F95 INTERFACE
SUBROUTINE GEMV([TRANSA], [M], [N], ALPHA, A, [LDA], X, [INCX], BETA,
Y, [INCY])
CHARACTER(LEN=1) :: TRANSA
INTEGER :: M, N, LDA, INCX, INCY
REAL(8) :: ALPHA, BETA
REAL(8), DIMENSION(:) :: X, Y
REAL(8), DIMENSION(:,:) :: A
SUBROUTINE GEMV_64([TRANSA], [M], [N], ALPHA, A, [LDA], X, [INCX],
BETA, Y, [INCY])
CHARACTER(LEN=1) :: TRANSA
INTEGER(8) :: M, N, LDA, INCX, INCY
REAL(8) :: ALPHA, BETA
REAL(8), DIMENSION(:) :: X, Y
REAL(8), DIMENSION(:,:) :: A
C INTERFACE
#include <sunperf.h>
void dgemv(char transa, int m, int n, double alpha, double
*a, int lda, double *x, int incx, double beta,
double *y, int incy);
void dgemv_64(char transa, long m, long n, double alpha,
double *a, long lda, double *x, long incx, double
beta, double *y, long incy);
dgemv performs one of the matrix-vector operations y :=
alpha*A*x + beta*y, or y := alpha*A'*x + beta*y, where alpha
and beta are scalars, x and y are vectors and A is an m by n
matrix.
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*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 <> 0. Unchanged on exit.
BETA (input)
On entry, BETA specifies the scalar beta. When
BETA is supplied 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 <> 0. Unchanged on exit.