strmv
strmv - perform one of the matrix-vector operations x := A*x, or x := A'*x
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(*)
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
#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);
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.
-
* 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 contain the lower
triangular matrix and the strictly upper triangular 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.