sgemv (3p)

Name

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

Synopsis

SUBROUTINE SGEMV(TRANSA, M, N, ALPHA, A, LDA, X, INCX, BETA, Y, INCY)

CHARACTER*1 TRANSA
INTEGER M, N, LDA, INCX, INCY
REAL ALPHA, BETA
REAL A(LDA,*), X(*), Y(*)

SUBROUTINE SGEMV_64(TRANSA, M, N, ALPHA, A, LDA, X, INCX, BETA, Y,
INCY)

CHARACTER*1 TRANSA
INTEGER*8 M, N, LDA, INCX, INCY
REAL ALPHA, BETA
REAL 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 :: ALPHA, BETA
REAL, DIMENSION(:) :: X, Y
REAL, 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 :: ALPHA, BETA
REAL, DIMENSION(:) :: X, Y
REAL, DIMENSION(:,:) :: A




C INTERFACE
#include <sunperf.h>

void sgemv(char transa, int m, int n, float alpha, float *a,  int  lda,
float *x, int incx, float beta, float *y, int incy);

void  sgemv_64(char transa, long m, long n, float alpha, float *a, long
lda, float *x, long incx, float beta, float *y, long incy);

Description

Oracle Solaris Studio Performance Library                            sgemv(3P)



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


SYNOPSIS
       SUBROUTINE SGEMV(TRANSA, M, N, ALPHA, A, LDA, X, INCX, BETA, Y, INCY)

       CHARACTER*1 TRANSA
       INTEGER M, N, LDA, INCX, INCY
       REAL ALPHA, BETA
       REAL A(LDA,*), X(*), Y(*)

       SUBROUTINE SGEMV_64(TRANSA, M, N, ALPHA, A, LDA, X, INCX, BETA, Y,
             INCY)

       CHARACTER*1 TRANSA
       INTEGER*8 M, N, LDA, INCX, INCY
       REAL ALPHA, BETA
       REAL 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 :: ALPHA, BETA
       REAL, DIMENSION(:) :: X, Y
       REAL, 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 :: ALPHA, BETA
       REAL, DIMENSION(:) :: X, Y
       REAL, DIMENSION(:,:) :: A




   C INTERFACE
       #include <sunperf.h>

       void sgemv(char transa, int m, int n, float alpha, float *a,  int  lda,
                 float *x, int incx, float beta, float *y, int incy);

       void  sgemv_64(char transa, long m, long n, float alpha, float *a, long
                 lda, float *x, long incx, float beta, float *y, long incy);



PURPOSE
       sgemv 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                         sgemv(3P)