improve identity

src/Matrix.cpp

@@ -109,17 +109,20 @@ void Matrix::Transpose() {
 }
 
 void Matrix::Identity() {
+	assert(m_Lignes == m_Colonnes);
 	for (std::size_t i = 0; i < m_Lignes; i++) {
 		for (std::size_t j = i; j < m_Colonnes; j++) {
-			if (i != j) {
-				at(i, j) = 0;
-			} else {
-				at(i, j) = 1;
-			}
+			at(i, j) = i == j;
 		}
 	}
 }
 
+Matrix Matrix::Identity(std::size_t taille) {
+	Matrix id{taille, taille};
+	id.Identity();
+	return id;
+}
+
 bool Matrix::IsInversed() const {
 	for (std::size_t i = 0; i < m_Lignes; ++i) {
 		std::size_t j;