public static void Subtract(ref Matrix2x2 a, ref Matrix2x2 b, out Matrix2x2 result) { float m11 = a.M11 - b.M11; float m12 = a.M12 - b.M12; float m21 = a.M21 - b.M21; float m22 = a.M22 - b.M22; result.M11 = m11; result.M12 = m12; result.M21 = m21; result.M22 = m22; }