dscal(3P) Sun Performance Library dscal(3P)NAMEdscal - Compute y := alpha * y
SYNOPSIS
SUBROUTINE DSCAL(N, ALPHA, Y, INCY)
INTEGER N, INCY
DOUBLE PRECISION ALPHA
DOUBLE PRECISION Y(*)
SUBROUTINE DSCAL_64(N, ALPHA, Y, INCY)
INTEGER*8 N, INCY
DOUBLE PRECISION ALPHA
DOUBLE PRECISION Y(*)
F95 INTERFACE
SUBROUTINE SCAL([N], ALPHA, Y, [INCY])
INTEGER :: N, INCY
REAL(8) :: ALPHA
REAL(8), DIMENSION(:) :: Y
SUBROUTINE SCAL_64([N], ALPHA, Y, [INCY])
INTEGER(8) :: N, INCY
REAL(8) :: ALPHA
REAL(8), DIMENSION(:) :: Y
C INTERFACE
#include <sunperf.h>
void dscal(int n, double alpha, double *y, int incy);
void dscal_64(long n, double alpha, double *y, long incy);
PURPOSEdscal Compute y := alpha * y where alpha is a scalar and y is an n-vec‐
tor.
ARGUMENTS
N (input)
On entry, N specifies the number of elements in the vector.
N must be at least one for the subroutine to have any visible
effect. Unchanged on exit.
ALPHA (input)
On entry, ALPHA specifies the scalar alpha. Unchanged on
exit.
Y (input/output)
( 1 + ( n - 1 )*INCY ). On entry, the incremented array Y
must contain the 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.
This routine returns immediately if INCY is less than or
equal to zero. Unchanged on exit.
6 Mar 2009 dscal(3P)
