private void StepForU(int u)
{
List <int> _I_u = FlatNonZeroInRow(u, Ratings);
double[,] _regE = EyeMulDouble(d);
MyMatrix <double> gauss = new MyMatrix <double>(d);
//Liczymy _P_I_u_(czyli kolumny z macierzy P o indeksach w _I_u_)
double[,] _P_I_u = MyMatrix <double> .GetMatrixFromOtherMatrixColumns(P, _I_u);
double[,] _P_I_u_T = MyMatrix <double> .Transpose(_P_I_u);
double[,] _A_u = MyMatrix <double> .Add(
MyMatrix <double> .Multiplication(_P_I_u, _P_I_u_T),
_regE);
double[] _V_u = Count_V_u(_I_u, P, Ratings, u);
//Jak już mamy wszystko policzone, możemy podstawić A_u oraz V_u do gaussa:
gauss.A = _A_u;
gauss.B = _V_u;
gauss.ComputePG();
double[] GaussSolution = gauss.Xgauss;
U = InsertGaussColumn(u, U, GaussSolution);
}
private void StepForP(int p)
{
List <int> _I_p = FlatNonZeroInColumn(p, Ratings);
double[,] _regE = EyeMulDouble(d);
MyMatrix <double> gauss = new MyMatrix <double>(d);
double[,] _U_I_p = MyMatrix <double> .GetMatrixFromOtherMatrixColumns(U, _I_p);
double[,] _U_I_p_T = MyMatrix <double> .Transpose(_U_I_p);
double[,] _B_u =
MyMatrix <double> .Add(
MyMatrix <double> .Multiplication(_U_I_p, _U_I_p_T),
_regE
);
double[] _W_u = Count_W_u(_I_p, U, Ratings, p);
gauss.A = _B_u;
gauss.B = _W_u;
gauss.ComputePG();
double[] GaussSolution = gauss.Xgauss;
P = InsertGaussColumn(p, P, GaussSolution);
}
