Numerische-Methoden/MonteCarlo-Java
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This commit is contained in:
Parric007
2024-05-16 11:47:54 +02:00
parent f16c0880bc
commit 560008f06b
2 changed files with 32 additions and 18 deletions
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32
MonteCarlo_Java/src/Main.java
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@@ -1,3 +1,6 @@
import java.util.ArrayList;
import java.util.List;
public class Main {
static Bounds bounds;
static final float lowerX = 0;
@@ -111,24 +114,33 @@ public class Main {
double pointsInside = 0;
long startTime = System.nanoTime();
double real_value = getRealIntegral(bounds.getX());
List<Double> integralList = new ArrayList<>();
List<Double> errorList = new ArrayList<>();
for (int i = 0; i< 20; i++) {
for (int i = 0; i< threadCount; i++) {
Point toTestPoint;
for (int ii = 0; ii < samples; ii++) {
toTestPoint = bounds.getRandomPoint();
if (getIsInside(toTestPoint)) {
pointsInside++;
}
}
Threading t = new Threading();
t.start();t.join();
pointsInside += t.getPoints();
double integral = (pointsInside/(samples)) * bounds.area();
double error = Math.abs(real_value-integral);
errorList.add(error); integralList.add(integral);
integral = 0; error = 0; pointsInside = 0;
}
double integral = (pointsInside/(samples*threadCount)) * bounds.area();
double error = Math.abs(real_value-integral);
System.out.println("The approximated Integral of the function is: " + String.format("%.2f", integral));
System.out.println("The approximated Integral of the function is: " + String.format("%.2f", integralList.getFirst()));
System.out.println("The real Integral of the function is: " + String.format("%.2f",real_value));
System.out.println("That's an error of " + String.format("%.8f", error) +" or " + String.format("%.8f",(error/real_value)*100) + "%");
System.out.println("And the whole thing took " + String.format("%.6f", (System.nanoTime()-startTime)/1000000000.0) + " Seconds for " + String.format("%,.0f", samples*threadCount) + " samples");
System.out.println("That's an error of " + String.format("%.8f", errorList.getFirst()) +" or " + String.format("%.8f",(errorList.getFirst()/real_value)*100) + "%");
System.out.println("And the whole thing took " + String.format("%.6f", (System.nanoTime()-startTime)/1000000000.0) + " Seconds for " + String.format("%,.0f", samples) + " samples");
System.out.println(errorList); System.out.println(integralList);
}
static class Threading extends Thread {
private double pointsInsideThread = 0;