private static double EvtWrapper(EvtFun f, double newh, double x1, ReadOnlySpan <double> y1, ReadOnlySpan <double> yp1, double x2, ReadOnlySpan <double> y2, ReadOnlySpan <double> yp2, int n, object o)
{
Span <double> newy = stackalloc double[n];
ODE.CubicHermiteInterpolant(x1, y1, yp1, x2, y2, yp2, x1 + newh, n, newy);
return(f(newy, x1 + newh, n, o));
}
static void Main(string[] args)
{
double[] y0 = { 1, 0, 0, 0, 1, 0 };
double[] x = { 0 * 0.78539816339, 1 * 0.78539816339, 2 * 0.78539816339, 3 * 0.78539816339, 4 * 0.78539816339 };
ODE ode = new ODE(y0, 6, x, 1e-9, 0, allvals: true);
ode.RKF45(centralForce, null);
for (int i = 0; i < ode.xlist.Count; i++)
{
Console.Write(ode.xlist[i]);
if (i != ode.xlist.Count - 1)
{
Console.Write(", ");
}
}
Console.Write("\n");
for (int i = 0; i < ode.ylist.Count; i++)
{
for (int j = 0; j < 6; j++)
{
Console.Write(ode.ylist[i][j]);
if (j != 5)
{
Console.Write(", ");
}
}
Console.Write("\n");
}
}
static void Main2(string[] args)
{
List <double []> ylist = new List <double []>();
List <double> xlist = new List <double>();
double[] y0 = { 1, 0, 0, 0, 1, 0 };
double[] x = { 0 * 0.78539816339, 1 * 0.78539816339, 2 * 0.78539816339, 3 * 0.78539816339, 4 * 0.78539816339 };
double[][] y = new double[][]
{
new double[5],
new double[5],
new double[5],
new double[5],
new double[5],
new double[5],
};
var watch = System.Diagnostics.Stopwatch.StartNew();
for (int i = 0; i < 100000; i++)
{
ODE.RKDP547FM(centralForce, null, y0, 6, x, y, 1e-9, 0, xlist: xlist, ylist: ylist);
}
watch.Stop();
Console.WriteLine("ms : {0:F6}", watch.ElapsedMilliseconds);
for (int i = 0; i < xlist.Count; i++)
{
Console.Write(xlist[i]);
if (i != xlist.Count - 1)
{
Console.Write(", ");
}
}
Console.Write("\n");
for (int i = 0; i < ylist.Count; i++)
{
for (int j = 0; j < 6; j++)
{
Console.Write(ylist[i][j]);
if (j != 5)
{
Console.Write(", ");
}
}
Console.Write("\n");
}
}
static void Main(string[] args)
{
List <double []> ylist = new List <double []>();
List <double> xlist = new List <double>();
double[] y0 = { 0, 20 };
double[] x = { 0, 5 };
double[][] y = new double[][]
{
new double[2],
new double[2],
};
EvtFun[] EvtFuns = { ballevent };
ODE.RKDP547FM(ball, null, y0, 2, x, y, 1e-9, 0, hmin: 1e-8, xlist: xlist, ylist: ylist, EvtFuns: EvtFuns);
for (int i = 0; i < xlist.Count; i++)
{
Console.Write(xlist[i]);
if (i != xlist.Count - 1)
{
Console.Write(", ");
}
}
Console.Write("\n");
for (int i = 0; i < ylist.Count; i++)
{
for (int j = 0; j < 2; j++)
{
Console.Write(ylist[i][j]);
if (j != 1)
{
Console.Write(", ");
}
}
Console.Write("\n");
}
}