added transpose of matrix with the same object with tests

MatrixAlgorithms/Matrix2d.cpp

@@ -247,4 +247,22 @@ std::ostream& operator<<(std::ostream& os, const Matrix2d& matrix)
     }
 
     return os;
+}
+void Matrix2d::transpose()
+{
+    size_t cols = getCols();
+    size_t rows = getRows();
+    std::vector<double> vd = toVector();
+    std::vector<std::vector<double>> mat_t;
+    for (int i = 0; i < cols; i++)
+    {
+        std::vector<double> row_t;
+        for (int j = 0; j < rows; j++)
+        {
+            double cell = getValue(j, i);
+            row_t.push_back(cell);
+        }
+        mat_t.push_back(row_t);
+    }
+    this->numbersArray = mat_t;
 }

MatrixAlgorithms/Matrix2d.h

@@ -47,6 +47,7 @@ class Matrix2d
     std::size_t getRows() const;
     std::size_t getCols() const;
     std::vector<double> toVector() const;
+    void transpose();
 
 private:
     /*

MatrixAlgorithms/MatrixAlgorithms.cpp

@@ -325,6 +325,16 @@ void TEST_018_operations_chain()
     Matrix2d result = (mat1 - mat2) * mat3;
     assert(result == expectedResult1);
 }
+void TEST_019_transpose()
+{
+    Matrix2d mat1 = {{2, 3, 4, 8}, {5, 6, 7, 9}};
+    mat1.transpose();
+    std::vector<double> expected = {2, 5, 3, 6, 4, 7, 8, 9};
+    assert(mat1.toVector() == expected);
+    Matrix2d mat2 = {{7}, {9}, {2}};
+    std::vector<double> expectedResult2 = {7, 9, 2};
+    assert(mat2.toVector() == expectedResult2);
+}
 
 int main()
 {
@@ -346,4 +356,5 @@ int main()
     TEST_016_subtraction();
     TEST_017_subtraction_2();
     TEST_018_operations_chain();
+    TEST_019_transpose();
 }