public void ChordMethod(double x1, double x2, CurrentFucntion function)
{
int iii = 0;
int N = 1000;
double k = Math.Abs(function(x1) / function(x2));
double xmid = (x1 + (k * x2)) / (1 + k);
while (Math.Abs(function(xmid)) > precisionPoint && iii <= N)
{
if (DifferentSign(function(x1), function(xmid), function))
{
x2 = xmid;
}
else
{
x1 = xmid;
}
k = Math.Abs(function(x1) / function(x2));
xmid = (x1 + k * x2) / (1 + k);
iii = iii + 1;
}
richTextBox1.AppendText(String.Format(" {0,6:d} {1,12:f7} {2,12:f7} {3,12:f7} {4,12:f7} {5,12:f7} {6,12:f7}\n",
iii, xmid, function(xmid), x1, x2, function(x1), function(x2)));
CHORDS.Points.AddXY(xmid, 0);
}
private void FormInitializer(float x1, float x2, CurrentFucntion function, string functionName)
{
ClearForm(); // išvalomi programos duomenys
PreparareForm(-5, 5, -10, 10);
SeriesInitializer();
this.x1 = x1; // izoliacijos intervalo pradžia
this.x2 = x2; // izoliacijos intervalo galas
xstep = 0.1F;
richTextBox1.AppendText("Iteracija x F(x) x1 x2 F(x1) F(x2) \n");
double x = -50;
for (int i = 0; i < 5000; i++)
{
FNC.Points.AddXY(x, function(x));
x = x + (2 * Math.PI) / 50;
//Console.WriteLine("x->{0}",x);
Console.WriteLine("F(x)->{0}", function(x));
}
FNC.BorderWidth = 2;
}
public void NewtonMethod(double x1, double x2, CurrentFucntion function, CurrentFucntionD functionD)
{
int iii = 0;
int N = 1000;
double answer = x1;
double step = function(answer) / functionD(x1);
while (Math.Abs(function(answer)) > precisionPoint && iii <= N)
{
step = step = function(answer) / functionD(x1);
answer -= step;
iii++;
}
richTextBox1.AppendText(String.Format(" {0,6:d} {1,12:f7} {2,12:f7}\n",
iii, answer, function(answer)));
NEWTON.Points.AddXY(answer, 0);
}
// ---------------------------------------------- KITI METODAI ----------------------------------------------
/// <summary>
/// Nustotoma ar f(num1) ir f(num2) ženklai yra skirtingi
/// </summary>
private bool DifferentSign(double num1, double num2, CurrentFucntion function)
{
return(Math.Sign((double)function(num1)) != Math.Sign((double)function(num2)));
}
public void DecreasingIntervalMethod(double xstart, double xend, double step, CurrentFucntion function)
{
if (found)
{
return;
}
if (Math.Abs(Math.Abs(function(xstart + step)) - (Math.Abs(function(xstart)))) > precisionPoint)
{
for (double i = xstart; i < xend; i += step)
{
itterations++;
if (DifferentSign(i, i + step, function))
{
DecreasingIntervalMethod(i, i + step, step / 5, function);
}
}
}
else
{
found = true;
if (found)
{
richTextBox1.AppendText(String.Format(" {0,6:d} {1,12:f7} {2,12:f7} {3,12:f7} {4,12:f7} {5,12:f7} {6,12:f7}\n",
itterations, xstart + (step / 2), function(xstart + (step / 2)), xstart, xend, function(xstart), function(xend)));
ITTERATION.Points.AddXY(xstart, 0);
ITTERATION.Points.AddXY(xstart + step, 0);
}
}
}
