dgemv (3p)

Name

dgemv - vector operations y := alpha*A*x + beta*y or y := alpha*A'*x + beta*y

Synopsis

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);

Description

Oracle Solaris Studio Performance Library                            dgemv(3P)



NAME
       dgemv  - perform one of the matrix-vector operations   y := alpha*A*x +
       beta*y or y := alpha*A'*x + beta*y


SYNOPSIS
       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);



PURPOSE
       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.


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*A'*x + beta*y.

                 Unchanged on exit.


       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  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 <> 0.  Unchanged on exit.




                                  7 Nov 2015                         dgemv(3P)