dotColumn method

double dotColumn (int j, Vector2 v)

Returns the dot product of column j and v.

Implementation 

double dotColumn(int j, Vector2 v) {
  final Float32List vStorage = v._v2storage;
  return _m2storage[j * 2] * vStorage[0] +
      _m2storage[(j * 2) + 1] * vStorage[1];
}