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Updated: June 2017
 
 

strmv (3p)

Name

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

Synopsis

SUBROUTINE STRMV(UPLO, TRANSA, DIAG, N, A, LDA, Y, INCY)

CHARACTER*1 UPLO, TRANSA, DIAG
INTEGER N, LDA, INCY
REAL A(LDA,*), Y(*)

SUBROUTINE STRMV_64(UPLO, TRANSA, DIAG, N, A, LDA, Y, INCY)

CHARACTER*1 UPLO, TRANSA, DIAG
INTEGER*8 N, LDA, INCY
REAL A(LDA,*), Y(*)




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

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

SUBROUTINE TRMV_64(UPLO, TRANSA, DIAG, N, A, LDA, Y, INCY)

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




C INTERFACE
#include <sunperf.h>

void strmv(char uplo, char transa, char diag, int n, float *a, int lda,
float *y, int incy);

void strmv_64(char uplo, char transa, char diag, long n, float *a, long
lda, float *y, long incy);

Description

Oracle Solaris Studio Performance Library                            strmv(3P)



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


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

       CHARACTER*1 UPLO, TRANSA, DIAG
       INTEGER N, LDA, INCY
       REAL A(LDA,*), Y(*)

       SUBROUTINE STRMV_64(UPLO, TRANSA, DIAG, N, A, LDA, Y, INCY)

       CHARACTER*1 UPLO, TRANSA, DIAG
       INTEGER*8 N, LDA, INCY
       REAL A(LDA,*), Y(*)




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

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

       SUBROUTINE TRMV_64(UPLO, TRANSA, DIAG, N, A, LDA, Y, INCY)

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




   C INTERFACE
       #include <sunperf.h>

       void strmv(char uplo, char transa, char diag, int n, float *a, int lda,
                 float *y, int incy);

       void strmv_64(char uplo, char transa, char diag, long n, float *a, long
                 lda, float *y, long incy);



PURPOSE
       strmv 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.


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)
                 Before entry with  UPLO = 'U' or 'u',  the  leading  n  by  n
                 upper  triangular  part of the array A must contain the upper
                 triangular matrix and the strictly lower triangular part of A
                 is  not referenced.  Before entry with UPLO = 'L' or 'l', the
                 leading n by n lower triangular part of the array A must con-
                 tain  the lower triangular matrix and the strictly upper tri-
                 angular part of A is not referenced.  Note that when  DIAG  =
                 'U'  or  'u',  the  diagonal elements of A are not referenced
                 either, but are assumed to be unity.  Unchanged on exit.


       LDA (input)
                 On entry, LDA specifies the first dimension of A as  declared
                 in  the calling (sub) program. LDA >= max( 1, n ).  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                         strmv(3P)