dtpmv (3p)

Name

dtpmv - vector operations x := A*x, or x := A'*x

Synopsis

SUBROUTINE DTPMV(UPLO, TRANSA, DIAG, N, A, Y, INCY)

CHARACTER*1 UPLO, TRANSA, DIAG
INTEGER N, INCY
DOUBLE PRECISION A(*), Y(*)

SUBROUTINE DTPMV_64(UPLO, TRANSA, DIAG, N, A, Y, INCY)

CHARACTER*1 UPLO, TRANSA, DIAG
INTEGER*8 N, INCY
DOUBLE PRECISION A(*), Y(*)




F95 INTERFACE
SUBROUTINE TPMV(UPLO, TRANSA, DIAG, N, A, Y, INCY)

CHARACTER(LEN=1) :: UPLO, TRANSA, DIAG
INTEGER :: N, INCY
REAL(8), DIMENSION(:) :: A, Y

SUBROUTINE TPMV_64(UPLO, TRANSA, DIAG, N, A, Y, INCY)

CHARACTER(LEN=1) :: UPLO, TRANSA, DIAG
INTEGER(8) :: N, INCY
REAL(8), DIMENSION(:) :: A, Y




C INTERFACE
#include <sunperf.h>

void dtpmv(char uplo, char transa, char diag, int n, double *a,  double
*y, int incy);

void  dtpmv_64(char  uplo,  char  transa, char diag, long n, double *a,
double *y, long incy);

Description

Oracle Solaris Studio Performance Library                            dtpmv(3P)



NAME
       dtpmv  -  perform one of the matrix-vector operations x := A*x, or x :=
       A'*x


SYNOPSIS
       SUBROUTINE DTPMV(UPLO, TRANSA, DIAG, N, A, Y, INCY)

       CHARACTER*1 UPLO, TRANSA, DIAG
       INTEGER N, INCY
       DOUBLE PRECISION A(*), Y(*)

       SUBROUTINE DTPMV_64(UPLO, TRANSA, DIAG, N, A, Y, INCY)

       CHARACTER*1 UPLO, TRANSA, DIAG
       INTEGER*8 N, INCY
       DOUBLE PRECISION A(*), Y(*)




   F95 INTERFACE
       SUBROUTINE TPMV(UPLO, TRANSA, DIAG, N, A, Y, INCY)

       CHARACTER(LEN=1) :: UPLO, TRANSA, DIAG
       INTEGER :: N, INCY
       REAL(8), DIMENSION(:) :: A, Y

       SUBROUTINE TPMV_64(UPLO, TRANSA, DIAG, N, A, Y, INCY)

       CHARACTER(LEN=1) :: UPLO, TRANSA, DIAG
       INTEGER(8) :: N, INCY
       REAL(8), DIMENSION(:) :: A, Y




   C INTERFACE
       #include <sunperf.h>

       void dtpmv(char uplo, char transa, char diag, int n, double *a,  double
                 *y, int incy);

       void  dtpmv_64(char  uplo,  char  transa, char diag, long n, double *a,
                 double *y, long incy);



PURPOSE
       dtpmv performs one of the matrix-vector operations x := A*x,  or  x  :=
       A'*x,  where x is an n element vector and  A is an n by n unit, or non-
       unit, upper or lower triangular matrix, supplied in packed form.


ARGUMENTS
       UPLO (input)
                 On entry, UPLO specifies whether the matrix is  an  upper  or
                 lower triangular matrix as follows:

                 UPLO = 'U' or 'u'   A is an upper triangular matrix.

                 UPLO = 'L' or 'l'   A is a lower triangular matrix.

                 Unchanged on exit.


       TRANSA (input)
                 On  entry,  TRANSA specifies the operation to be performed as
                 follows:

                 TRANSA = 'N' or 'n'   x := A*x.

                 TRANSA = 'T' or 't'   x := A'*x.

                 TRANSA = 'C' or 'c'   x := A'*x.

                 Unchanged on exit.


       DIAG (input)
                 On entry, DIAG specifies whether or not A is unit  triangular
                 as follows:

                 DIAG = 'U' or 'u'   A is assumed to be unit triangular.

                 DIAG = 'N' or 'n'   A is not assumed to be unit triangular.

                 Unchanged on exit.


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


       A (input)
                 ( ( n*( n + 1 ) )/2 ).  Before entry with  UPLO = 'U' or 'u',
                 the  array  A must contain the upper triangular 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 matrix
                 packed sequentially, column by column, so that A(  1  )  con-
                 tains  a(  1, 1 ), A( 2 ) and A( 3 ) contain a( 2, 1 ) and a(
                 3, 1 ) respectively, and so on.  Note that when  DIAG  =  'U'
                 or  'u',  the  diagonal elements of A are not referenced, but
                 are assumed to be unity.  Unchanged on exit.


       Y (input/output)
                 ( 1 + ( n - 1 )*abs( INCY ) ).  Before entry, the incremented
                 array  Y  must  contain the n element vector x. On exit, Y is
                 overwritten with the tranformed vector x.


       INCY (input)
                 On entry, INCY specifies the increment for the elements of Y.
                 INCY <> 0.  Unchanged on exit.




                                  7 Nov 2015                         dtpmv(3P)