public RungeKutta(DifEquation equation, Dictionary <string, double> initialCondition,
double[] section, int divisions)
{
Equation = equation;
InitialСondition = initialCondition;
Section = section;
Divisions = divisions;
Step = CalculateStep();
}
static void Main(string[] args)
{
var x = Expr.Variable("x");
var y = Expr.Variable("y");
//Example 1
Func <double, double, double> func1 = (x * x - 2 * y).Compile("x", "y");
DifEquation equation1 = new DifEquation(func1);
double[] section1 = new double[] { 0, 1 };
Dictionary <string, double> initialVal1 = new Dictionary <string, double>()
{
{ "x", 0 },
{ "y", 1 }
};
RungeKutta rungeKutta1 = new RungeKutta(equation1, initialVal1, section1, 10);
Console.WriteLine($"y' = {(x * x - 2 * y).ToString()}");
rungeKutta1.Solve();
//Example 2
Func <double, double, double> func2 = ((y - x * y * y) / x).Compile("x", "y");
DifEquation equation2 = new DifEquation(func2);
double[] section2 = new double[] { 1, 2 };
Dictionary <string, double> initialVal2 = new Dictionary <string, double>()
{
{ "x", 1 },
{ "y", 2 }
};
RungeKutta rungeKutta2 = new RungeKutta(equation2, initialVal2, section2, 10);
Console.WriteLine($"y' = {((y - x * y * y) / x).ToString()}");
rungeKutta2.Solve();
Console.ReadKey();
}
