/// <summary>
/// Performs step of integration
/// </summary>
/// <param name="t0">Step start</param>
/// <param name="t1">Step finish</param>
public override void Step(double t0, double t1)
{
isBusy = true;
if (Dim == 0)
{
return;
}
double dt = t1 - t0;
int i = 0;
foreach (IMeasurements m in equations)
{
IDifferentialEquationSolver s = m as IDifferentialEquationSolver;
m.UpdateMeasurements(true);
int n = s.GetVariablesCount();
for (int j = 0; j < n; j++)
{
w[i] = (double)m[j].Parameter();
f[i] = w[i];
++i;
}
s.CopyVariablesToSolver(i - s.GetVariablesCount(), w);
}
double t = t0;
timeProvider.Time = t;
i = 0;
foreach (IMeasurements m in equations)
{
IDifferentialEquationSolver s = m as IDifferentialEquationSolver;
s.CalculateDerivations();
for (int j = 0; j < s.GetVariablesCount(); j++)
{
IDerivation der = m[j] as IDerivation;
z[i] = Measurement.GetDouble(der.Derivation);
k[0, i] = z[i] * dt;
w[i] = f[i] + 0.5 * k[0, i];
++i;
}
s.CopyVariablesToSolver(i - s.GetVariablesCount(), w);
}
t = t0 + 0.5 * dt;
timeProvider.Time = t;
i = 0;
foreach (IMeasurements m in equations)
{
IDifferentialEquationSolver s = m as IDifferentialEquationSolver;
s.CalculateDerivations();
for (int j = 0; j < s.GetVariablesCount(); j++)
{
IDerivation der = m[j] as IDerivation;
z[i] = Measurement.GetDouble(der.Derivation);
k[1, i] = z[i] * dt;
w[i] = f[i] + 0.5 * k[1, i];
++i;
}
s.CopyVariablesToSolver(i - s.GetVariablesCount(), w);
}
t = t0 + 0.5 * dt;
timeProvider.Time = t;
i = 0;
foreach (IMeasurements m in equations)
{
IDifferentialEquationSolver s = m as IDifferentialEquationSolver;
s.CalculateDerivations();
for (int j = 0; j < s.GetVariablesCount(); j++)
{
IDerivation der = m[j] as IDerivation;
z[i] = Measurement.GetDouble(der.Derivation);
k[2, i] = z[i] * dt;
w[i] = f[i] + k[2, i];
++i;
}
s.CopyVariablesToSolver(i - s.GetVariablesCount(), w);
}
t = t0 + dt;
timeProvider.Time = t;
i = 0;
foreach (IMeasurements m in equations)
{
IDifferentialEquationSolver s = m as IDifferentialEquationSolver;
s.CalculateDerivations();
for (int j = 0; j < s.GetVariablesCount(); j++)
{
IDerivation der = m[j] as IDerivation;
z[i] = Measurement.GetDouble(der.Derivation);
k[3, i] = z[i] * dt;
++i;
}
}
i = 0;
foreach (IMeasurements m in equations)
{
IDifferentialEquationSolver s = m as IDifferentialEquationSolver;
for (int j = 0; j < s.GetVariablesCount(); j++)
{
f[i] += (k[0, i] + 2 * k[1, i] + 2 * k[2, i] + k[3, i]) / 6;
++i;
}
s.CopyVariablesToSolver(i - s.GetVariablesCount(), f);
}
i = 0;
foreach (IMeasurements m in equations)
{
IDifferentialEquationSolver s = m as IDifferentialEquationSolver;
for (int j = 0; j < s.GetVariablesCount(); j++)
{
IMeasurement measure = m[j];
IDerivation d = m[j] as IDerivation;
IMeasurement der = d.Derivation;
if (!(der is IDistribution))
{
++i;
continue;
}
IDistribution distr = der as IDistribution;
f[i] += distr.Integral;
distr.Reset();
++i;
}
s.CopyVariablesToSolver(i - s.GetVariablesCount(), f);
}
isBusy = false;
}
private int GetCount(IMeasurements m)
{
IDifferentialEquationSolver s = m as IDifferentialEquationSolver;
return(s.GetVariablesCount());
}