private double Integrate(int index, double a, double b)
{
IFunction function = functions[index];
if (!IsInvalid(function.Evaluate(a)) && !IsInvalid(function.Evaluate(b)))
{
return(integrator.Integrate(function, a, b).value);
}
return(0);
}
private void CalculateVolume(double a, double b)
{
if (!continuous)
{
PlanePlotter.ClearActions();
volume = double.NaN;
}
else
{
IFunction vFunction;
if (rotate == independent) // disc method
{
vFunction = functions[0].Generate("(function)^2");
volume = Math.PI * integrator.Integrate(vFunction, a, b).value;
}
else // washer method
{
vFunction = functions[0].Generate(independent.ToString() + "*(function)");
volume = 2 * Math.PI * integrator.Integrate(vFunction, a, b).value;
}
}
}