Mathx77 - 経済統計練習帳

import org.apache.commons.math3.analysis.integration.RombergIntegrator;
import org.apache.commons.math3.analysis.UnivariateFunction;
import org.apache.commons.math3.analysis.integration.*;
 
class pro{
 
public static void main(String[] args) {
 
pro test=new pro();
}
 
pro(){
 
    UnivariateIntegrator ri =new RombergIntegrator();
    double z=ri.integrate(1000,f,2,10);
    System.out.println(z);
 
}
 
UnivariateFunction f = new UnivariateFunction() {
public double value(double x) {
return  2*x;
}            
};
 
}