4
我正在嘗試整合一個非常簡單的功能。積分(x.dx)。我沒有得到1的答案,我得到的答案爲0或0.5,當我包含從0到1的限制。是否有什麼我誤解了在Apache公共庫中實現集成的東西?如何在apache commons math3庫中計算函數的集成?
import org.apache.commons.math3.analysis.integration.*;
import org.apache.commons.math3.analysis.polynomials.*;
public static void main(String args[])
{
SimpsonIntegrator simpson = new SimpsonIntegrator();
TrapezoidIntegrator trapezoid = new TrapezoidIntegrator();
double[] vector = new double[2];
vector[0] = 0;
vector[1] = 1;
PolynomialFunction f = new PolynomialFunction(vector);
UnivariateFunction uf = (UnivariateFunction)new PolynomialFunction(vector);
System.out.println("To String " + uf.toString());
System.out.println("Degree: " + f.degree());
double i = simpson.integrate(10, uf, -Float.MAX_VALUE, Float.MAX_VALUE);
double j = trapezoid.integrate(10, uf, 0, 1);
System.out.println("Simpson integral : " + i);
System.out.println("Trapezoid integral : " + j);
}
/*** OUTPUT
To String x
Degree: 1
Simpson integral : 0.0
Trapezoid integral : 0.5
***/
謝謝你,事實上,這是正確的:) – mtleis
@ medPhys-PL我不是在Java中的數學家和新手。有沒有辦法獲得梯形的每個區間的間隔數和大小? – DeepSidhu1313