static void LinearProblem()
{
double trueI = 1.66;
double iEps = 0.1;
double eps = 1.0e-15;
Source s = new Source(new Vector2(0, 0), new Vector2(100, 0), trueI);
Receiver r1 = new Receiver(new Vector2(800, 0));
Receiver r2 = new Receiver(new Vector2(900, 0));
Problem.ProblemInfo info = new Problem.ProblemInfo
{
Source = s,
Receivers = new List <Receiver>()
{
r1, r2
},
h = 300,
sigma1 = 1.0,
sigma2 = 2.0,
SolverType = SlaeSolver.SolverTypes.LOSLU
};
using (var writer = new StreamWriter(File.OpenWrite("I.txt")))
{
double[] TrueV = Problem.DirectProblem(info, eps);
TrueV[0] += TrueV[0] * 0.09;
double I0 = 5.0;
info.Source.I = I0;
double[] V0 = Problem.DirectProblem(info, eps);
double J = Problem.Functional(V0, TrueV);
writer.WriteLine("I; V0; V1; J");
writer.WriteLine($"{ trueI }; { TrueV[0] }; { TrueV[1] }; 0");
writer.WriteLine($"{ I0 }; { V0[0] }; { V0[1] }; { J }");
while (Math.Abs(I0 - trueI) > iEps)
{
double dI = Problem.InverseProblemLinear(info, V0, TrueV, eps, 0.05 * I0);
double b = 1.0;
double Ii = I0 + b * dI;
info.Source.I = Ii;
V0 = Problem.DirectProblem(info, eps);
Console.WriteLine("Вычисление нового I");
int k = 0;
while (b > 1.0e-5 && Problem.Functional(V0, TrueV) >= J)
{
Console.WriteLine($"Итерация: { k++ }, Ii: { Ii } ");
b /= 2;
Ii = I0 + b * dI;
info.Source.I = dI;
V0 = Problem.DirectProblem(info, eps);
}
if (b <= 1.0e-5)
{
Console.WriteLine($"b is too small. Last I: { I0 } ");
return;
}
else
{
Console.WriteLine($"New I: { Ii }");
I0 = Ii;
J = Problem.Functional(V0, TrueV);
writer.WriteLine($"{ I0 }; { V0[0] }; { V0[1] }; { J }");
}
}
}
}
static void NonlinearProblem()
{
double eps = 1.0e-15;
double sigmaEps = 0.001;
Source s = new Source(new Vector2(0, 0), new Vector2(100, 0), 5.0);
Receiver r1 = new Receiver(new Vector2(800, 0));
Receiver r2 = new Receiver(new Vector2(900, 0));
double trueSigma = 0.1;
Problem.ProblemInfo info = new Problem.ProblemInfo
{
Source = s,
Receivers = new List <Receiver>()
{
r1, r2
},
h = 300,
sigma1 = trueSigma,
sigma2 = 0.2,
SolverType = SlaeSolver.SolverTypes.LOSLU
};
using (var writer = new StreamWriter(File.OpenWrite("sigma.txt")))
{
double[] TrueV = Problem.DirectProblem(info, eps);
TrueV[0] += TrueV[0] * 0.0;
double sigma0 = 4.0;
Console.WriteLine($"new sigma { sigma0 }");
info.sigma1 = sigma0;
double[] V0 = Problem.DirectProblem(info, eps);
double J = Problem.Functional(V0, TrueV);
writer.WriteLine("I; V0; V1; J");
writer.WriteLine($"{ trueSigma }; { TrueV[0] }; { TrueV[1] }; 0");
writer.WriteLine($"{ sigma0 }; { V0[0] }; { V0[1] }; { J }");
while (Math.Abs(sigma0 - trueSigma) > sigmaEps)
{
double ds = Problem.InverseProblem(info, V0, TrueV, eps, 0.05 * sigma0);
double b = 1.0;
double sigmaI = sigma0 + b * ds;
info.sigma1 = sigmaI;
V0 = Problem.DirectProblem(info, eps);
Console.WriteLine("Вычисление новой sigma");
int k = 0;
while (b > 1.0e-5 && Problem.Functional(V0, TrueV) >= J)
{
Console.WriteLine($"Итерация: { k++ }, sigmaI: { sigmaI } ");
b /= 2;
sigmaI = sigma0 + b * ds;
info.sigma1 = sigmaI;
V0 = Problem.DirectProblem(info, eps);
}
if (b <= 1.0e-5)
{
Console.WriteLine($"b is too small. Last sigma: { sigma0 } ");
return;
}
else
{
Console.WriteLine($"New sigma: { sigmaI }");
sigma0 = sigmaI;
J = Problem.Functional(V0, TrueV);
writer.WriteLine($"{ sigma0 }; { V0[0] }; { V0[1] }; { J }");
}
}
}
}
