change transpose signature

src/Matrix.cpp

@@ -98,14 +98,14 @@ void Matrix::Load(const std::string& filename) {
 	}
 }
 
-Matrix Matrix::Transpose() const {
+void Matrix::Transpose() {
 	Matrix result{m_Colonnes, m_Lignes};
 	for (std::size_t i = 0; i < m_Lignes; i++) {
-		for (std::size_t j = i; j < m_Colonnes; j++) {
+		for (std::size_t j = 0; j < m_Colonnes; j++) {
 			result.at(j, i) = at(i, j);
 		}
 	}
-	return result;
+	*this = result;
 }
 
 void Matrix::Identity() {

src/Matrix.h

@@ -36,7 +36,7 @@ class Matrix {
 
 	void Load(const std::string& filename);
 
-	Matrix Transpose() const;
+	void Transpose();
 
 	void Identity();