NAME

dscal - Compute y := alpha ∗ y

SYNOPSIS

SUBROUTINE DSCAL (N, ALPHA, Y, INCY )

DOUBLE PRECISION    ALPHA

INTEGER INCY, N

DOUBLE PRECISION    Y( ∗ )

#include <sunperf.h>

void dscal(int n, double da, double ∗dx, int incx) ;

PURPOSE

DSCAL - Compute y := alpha ∗ y where alpha is a scalar and y is an n-vector. 
 

PARAMETERS

N - INTEGER. 
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 - DOUBLE PRECISION. 
On entry, ALPHA specifies the scalar alpha. Unchanged on exit.

Y - DOUBLE PRECISION array of DIMENSION at least
( 1 + ( m - 1 )∗abs( INCY ) ). On entry, the incremented array Y must contain the vector y. On exit, Y is overwritten by the updated vector y.

INCY - INTEGER. 
On entry, INCY specifies the increment for the elements of Y. INCY must not be zero. Unchanged on exit.

SunOS 5.0  —  Last change: 10 Dec 1998