static void TestLU()
{
var mat = new double[2, 2];
mat[0, 0] = 1;
mat[0, 1] = 2;
mat[1, 0] = 3;
mat[1, 1] = -2;
var lu = new LUDecomposition(mat, true);
var ans = lu.SolveLinearEquations(new[] { 1.0, -2.0 });
Debug.Log(lu.Substitutions[0] + ", " + lu.Substitutions[1]);
Debug.Log(ans[0] + ", " + ans[1]);
}
public SubstituteChargeMethod(
ParametricBound counterclock, ParametricDirichlet dirichlet,
int chargeCount, double distance)
{
// determin charge and sample positions
Charges = new Vector2D[chargeCount];
Samples = new Vector2D[chargeCount];
var sampleValues = new double[chargeCount];
var unit = 1.0 / chargeCount;
var dt = unit * 0.5;
for (var i = 0; i < chargeCount; i++)
{
Samples[i] = counterclock(unit * i);
sampleValues[i] = dirichlet(unit * i);
var diff = counterclock(unit * i + dt)
- counterclock(unit * i - dt);
var dir = new Vector2D(diff.Y, -diff.X).Normalized;
Charges[i] = Samples[i] + dir * distance;
}
// calculate Q values
var mat = new double[chargeCount, chargeCount];
var p2m = -1.0 / (Math.PI * 2.0);
for (var i = 0; i < chargeCount; i++)
{
for (var j = 0; j < chargeCount; j++)
{
mat[i, j] = Math.Log((Samples[i] - Charges[j]).Length) * p2m;
}
}
var lu = new LUDecomposition(mat);
Qs = lu.SolveLinearEquations(sampleValues);
this.bound = counterclock;
this.dirichlet = dirichlet;
}
