func ScalUnitaryTo(dst []float64, alpha float64, x []float64) {
	for i, v := range x {
		dst[i] = alpha * v
	}
}
ScalUnitaryTo is
for i, v := range x {
dst[i] = alpha * v
}
package f64
func ScalUnitary(alpha float64, x []float64) {
	for i := range x {
		x[i] *= alpha
	}
}