dotColumn method
Returns the dot product of column j and v.
Implementation
double dotColumn(int j, Vector4 v) {
final Float64List vStorage = v._v4storage;
return _m4storage[j * 4] * vStorage[0] +
_m4storage[j * 4 + 1] * vStorage[1] +
_m4storage[j * 4 + 2] * vStorage[2] +
_m4storage[j * 4 + 3] * vStorage[3];
}