Modify code and notebook

graphics.ipynb

@@ -102,7 +102,7 @@
     "    y = np.fromstring(data_str, sep=' ')\n",
     "    y_real = u(x)\n",
     "\n",
-    "    plt.plot(x, y, label=\"Linear element solution\", color='red')\n",
+    "    plt.plot(x, y, label=\"Linear element solution\", color='blue')\n",
     "    plt.plot(x, y_real, label=\"Numeral solution\", color='black')\n",
     "    plt.title(f\"Linear element, elements = {elements}\")\n",
     "    plt.grid(True)\n",

src/MemMAPR-MKE.cpp

@@ -9,7 +9,7 @@
 using namespace Eigen;
 int main() {
     std::cout << A << "u''" << " + " << B << "u'" << "+ " << C << "u + " << D << " = 0" << std::endl;
-    Solver slv(A, B, C, D, 2, 0, 10);
+    Solver slv(A, B, C, D, 20, 0, 10);
     std::cout << "Linear element:";
     slv.Execute_Linear(0, 5);
     std::cout << "\nCubic element:";

src/Solver.cpp

@@ -3,6 +3,9 @@
 using namespace Eigen;
 
 Solver::Solver(double _A, double _B, double _C, double _D, int _N, int _l, int _u) {
+    if (_N < 1)
+        throw std::runtime_error("N CAN BE OVER THAN 1!");
+
     A = _A, B = _B, C = _C, D = _D, N = _N;
     upper = _u, lower = _l;
 	L = (double)(upper - lower) / N;
@@ -50,16 +53,22 @@ void Solver::Execute_Linear(double val1, double val2) {
     std::cout << "Ansamb load vector:\n" << global_load << std::endl;
 #endif
 
-    // Граничные условия
+    // Boundary conditions
     double u_right = val2;
 
+    // 3rd type of boundary condition
     ansamb.row(0).setZero();
     ansamb(0, 0) = 1;
     ansamb(0, 1) = -1;
     global_load(0) = 0;
     ansamb(1, 1) -= A;
 
+    // 1st type of boundary condition
+    for (int i = 0; i < global_load.size(); ++i) {
+        global_load(i) = global_load(i) - u_right * ansamb(i, N + 1);
+    }
     ansamb.row(N + 1).setZero();
+    ansamb.col(N + 1).setZero();
     ansamb(N + 1, N + 1) = 1;
     global_load(N + 1) = u_right;
 
@@ -142,13 +151,19 @@ void Solver::Execute_Cubic(double val1, double val2) {
     // Граничные условия
     double u_right = val2;
 
+    // 3rd type of boundary condition
     ansamb.row(0).setZero();
     ansamb(0, 0) = 1;
     ansamb(0, 1) = -1;
     global_load(0) = 0;
     ansamb(1, 1) -= A;
 
+    // 1st type of boundary condition
+    for (int i = 0; i < global_load.size(); ++i) {
+        global_load(i) = global_load(i) - u_right * ansamb(i, mat_dim - 1);
+    }
     ansamb.row(mat_dim - 1).setZero();
+    ansamb.col(mat_dim - 1).setZero();
     ansamb(mat_dim - 1, mat_dim - 1) = 1;
     global_load(mat_dim - 1) = u_right;