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HPL_dscal(3) HPL Library Functions HPL_dscal(3)

HPL_dscal - x = alpha * x.

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

HPL_dscal scales the vector x by alpha.

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.

#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);

HPL_daxpy (3), HPL_dcopy (3), HPL_dswap (3).
February 24, 2016 HPL 2.2

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