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