added minor_matrix & algebraic_additions calculation

Author: potat-dev

Variants/Lab_12/var_12/main.cpp

@@ -175,11 +175,15 @@ int main() {
 
   mult3 *= 6;
   mult3.print();
+
   Matrix det_test({
     {2, 4, 3},
     {5, 7, 8},
     {6, 9, 1},
   });
 
-  cout << det_test.determinant() << endl;
+  cout << det_test.determinant() << endl << endl;
+
+  det_test.minor_matrix().print();
+  det_test.algebraic_additions().print();
 }

Variants/Lab_12/var_12/matrix.cpp

@@ -148,18 +148,34 @@ const double Matrix::determinant() {
     }
     default: {
       for (int i = 0; i < arr.size(); i++) {
-        if (i % 2) {
-          det -= arr[i][0] * this->minor(i, 0).determinant();
-        } else {
-          det += arr[i][0] * this->minor(i, 0).determinant();
-        }
+        det += (i % 2 ? -1 : 1) * arr[i][0] * this->minor(i, 0).determinant();
       }
       break;
     }
   }
   return det;
 }
 
+Matrix Matrix::minor_matrix() {
+  Matrix temp(arr.size());
+  for (int y = 0; y < arr.size(); y ++) {
+    for (int x = 0; x < arr.size(); x++) {
+      temp.set(x, y, this->minor(y, x).determinant());
+    }
+  }
+  return temp;
+}
+
+Matrix Matrix::algebraic_additions() {
+  Matrix temp = this->minor_matrix();
+  for (int x = 0; x < arr.size(); x++) {
+    for (int y = 0; y < arr.size(); y++) {
+      if ((x + y) % 2) temp.arr[y][x] *= -1;
+    }
+  }
+  return temp;
+}
+
 // операторы
 
 Matrix& Matrix::operator+=(const Matrix& m) {

Variants/Lab_12/var_12/matrix.h

@@ -12,15 +12,18 @@ class Matrix {
 
   public:
     // конструтроры (не лего)
+    
     Matrix(unsigned int size = 1, double def = 0);
     Matrix(vector <vector <double>> temp); 
 
     // сеттеры
+
     Matrix& set(unsigned int x, unsigned int y, double value);
     Matrix& set(vector <vector <double>> temp);
     Matrix& set(Matrix& m);
 
     // геттеры
+
     double get(unsigned int x, unsigned int y);
     const unsigned int size();
     const double determinant();