scale method

void scale (double scale)

Scale this by scale.

Implementation 

void scale(double scale) {
  _m2storage[0] = _m2storage[0] * scale;
  _m2storage[1] = _m2storage[1] * scale;
  _m2storage[2] = _m2storage[2] * scale;
  _m2storage[3] = _m2storage[3] * scale;
}