dspmv (3p)

Name

dspmv - vector operation y := alpha*A*x + beta*y

Synopsis

SUBROUTINE DSPMV(UPLO, N, ALPHA, A, X, INCX, BETA, Y, INCY)

CHARACTER*1 UPLO
INTEGER N, INCX, INCY
DOUBLE PRECISION ALPHA, BETA
DOUBLE PRECISION A(*), X(*), Y(*)

SUBROUTINE DSPMV_64(UPLO, N, ALPHA, A, X, INCX, BETA, Y, INCY)

CHARACTER*1 UPLO
INTEGER*8 N, INCX, INCY
DOUBLE PRECISION ALPHA, BETA
DOUBLE PRECISION A(*), X(*), Y(*)




F95 INTERFACE
SUBROUTINE SPMV(UPLO, N, ALPHA, A, X, INCX, BETA, Y, INCY)

CHARACTER(LEN=1) :: UPLO
INTEGER :: N, INCX, INCY
REAL(8) :: ALPHA, BETA
REAL(8), DIMENSION(:) :: A, X, Y

SUBROUTINE SPMV_64(UPLO, N, ALPHA, A, X, INCX, BETA, Y, INCY)

CHARACTER(LEN=1) :: UPLO
INTEGER(8) :: N, INCX, INCY
REAL(8) :: ALPHA, BETA
REAL(8), DIMENSION(:) :: A, X, Y




C INTERFACE
#include <sunperf.h>

void  dspmv(char  uplo,  int n, double alpha, double *a, double *x, int
incx, double beta, double *y, int incy);

void dspmv_64(char uplo, long n, double alpha, double  *a,  double  *x,
long incx, double beta, double *y, long incy);

Description

Oracle Solaris Studio Performance Library                            dspmv(3P)



NAME
       dspmv - perform the matrix-vector operation   y := alpha*A*x + beta*y


SYNOPSIS
       SUBROUTINE DSPMV(UPLO, N, ALPHA, A, X, INCX, BETA, Y, INCY)

       CHARACTER*1 UPLO
       INTEGER N, INCX, INCY
       DOUBLE PRECISION ALPHA, BETA
       DOUBLE PRECISION A(*), X(*), Y(*)

       SUBROUTINE DSPMV_64(UPLO, N, ALPHA, A, X, INCX, BETA, Y, INCY)

       CHARACTER*1 UPLO
       INTEGER*8 N, INCX, INCY
       DOUBLE PRECISION ALPHA, BETA
       DOUBLE PRECISION A(*), X(*), Y(*)




   F95 INTERFACE
       SUBROUTINE SPMV(UPLO, N, ALPHA, A, X, INCX, BETA, Y, INCY)

       CHARACTER(LEN=1) :: UPLO
       INTEGER :: N, INCX, INCY
       REAL(8) :: ALPHA, BETA
       REAL(8), DIMENSION(:) :: A, X, Y

       SUBROUTINE SPMV_64(UPLO, N, ALPHA, A, X, INCX, BETA, Y, INCY)

       CHARACTER(LEN=1) :: UPLO
       INTEGER(8) :: N, INCX, INCY
       REAL(8) :: ALPHA, BETA
       REAL(8), DIMENSION(:) :: A, X, Y




   C INTERFACE
       #include <sunperf.h>

       void  dspmv(char  uplo,  int n, double alpha, double *a, double *x, int
                 incx, double beta, double *y, int incy);

       void dspmv_64(char uplo, long n, double alpha, double  *a,  double  *x,
                 long incx, double beta, double *y, long incy);



PURPOSE
       dspmv  performs  the  matrix-vector  operation y := alpha*A*x + beta*y,
       where alpha and beta are scalars, x and y are n element vectors  and  A
       is an n by n symmetric matrix, supplied in packed form.


ARGUMENTS
       UPLO (input)
                 On  entry, UPLO specifies whether the upper or lower triangu-
                 lar part of the matrix A is supplied in the packed array A as
                 follows:

                 UPLO  =  'U'  or 'u'   The upper triangular part of A is sup-
                 plied in A.

                 UPLO = 'L' or 'l'   The lower triangular part of  A  is  sup-
                 plied in A.

                 Unchanged on exit.


       N (input)
                 On  entry,  N  specifies  the order of the matrix A.  N >= 0.
                 Unchanged on exit.


       ALPHA (input)
                 On entry, ALPHA specifies the  scalar  alpha.   Unchanged  on
                 exit.


       A (input)
                 (  ( n*( n + 1 ) )/2 ).  Before entry with UPLO = 'U' or 'u',
                 the array A must contain the upper  triangular  part  of  the
                 symmetric  matrix  packed  sequentially, column by column, so
                 that A( 1 ) contains a( 1, 1 ), A( 2 ) and A( 3 ) contain  a(
                 1,  2  ) and a( 2, 2 ) respectively, and so on.  Before entry
                 with UPLO = 'L' or 'l', the array A must  contain  the  lower
                 triangular  part of the symmetric matrix packed sequentially,
                 column by column, so that A( 1 ) contains a( 1, 1 ), A(  2  )
                 and  A( 3 ) contain a( 2, 1 ) and a( 3, 1 ) respectively, and
                 so on.  Unchanged on exit.


       X (input)
                 ( 1 + ( n - 1 )*abs( INCX ) ).  Before entry, the incremented
                 array  X  must  contain the n element 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 + ( n - 1 )*abs( INCY ) ).  Before entry, the incremented
                 array Y must contain the n element 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                         dspmv(3P)