HPL_dscal man page

HPL_dscal — x = alpha * x.

Synopsis

#include "hpl.h"
void HPL_dscal( const int N, const double ALPHA, double * X, const int INCX );

Description

HPL_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).

Info

October 26, 2012 HPL 2.1 HPL Library Functions