HPL_dscal(3) HPL Library Functions HPL_dscal(3)NAMEHPL_dscal - x = alpha * x.
SYNOPSIS
#include "hpl.h"
void HPL_dscal( const int N, const double ALPHA, double * X, const int
INCX );
DESCRIPTIONHPL_dscal scales the vector x by alpha.
ARGUMENTS
N (local input) const int
On entry, N specifies the length of the vector x. N must be
at least zero.
ALPHA (local input) const double
On entry, ALPHA specifies the scalar alpha. When ALPHA is
supplied as zero, then the entries of the incremented array X
need not be set on input.
X (local input/output) double *
On entry, X is an incremented array of dimension at least (
1 + ( n - 1 ) * abs( INCX ) ) that contains the vector x. On
exit, the entries of the incremented array X are scaled by
the scalar alpha.
INCX (local input) const int
On entry, INCX specifies the increment for the elements of X.
INCX must not be zero.
EXAMPLE
#include "hpl.h"
int main(int argc, char *argv[])
{
double x[3];
x[0] = 1.0; x[1] = 2.0; x[2] = 3.0;
HPL_dscal( 3, 2.0, x, 1 );
printf("x=[%f,%f,%f]\n", x[0], x[1], x[2]);
exit(0); return(0);
}
SEE ALSO
HPL_daxpy (3), HPL_dcopy (3), HPL_dswap (3).
HPL 2.1 October 26, 2012 HPL_dscal(3)
