Contents
dtpmv - perform one of the matrix-vector operations x :=
A*x, or x := A'*x
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);
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.
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.
TRANSA is defaulted to 'N' for F95 INTERFACE.
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 tri-
angular.
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 ) respec-
tively, and so on. Before entry with UPLO = 'L'
or 'l', the array A must contain the lower tri-
angular 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 ) respec-
tively, and so on. Note that when DIAG = 'U' or
'u', the diagonal elements of A are not refer-
enced, 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 tran-
formed vector x.
INCY (input)
On entry, INCY specifies the increment for the
elements of Y. INCY <> 0. Unchanged on exit.