NAME

SYNOPSIS

void HPL_dscal( const int N, const double ALPHA, double * X, const int INCX );

DESCRIPTION

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

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