edu.stanford.nlp.optimization
Class MinimizationExample

java.lang.Object
  |
  +--edu.stanford.nlp.optimization.MinimizationExample

public class MinimizationExample

extends Object

Example of using the minimization classes. The class contents is included here in the documentation to make the example easy to see.

 public class MinimizationExample {
 
   // Sum of squares objective
   private static class SumSquaresFunction implements DiffFunction {
     public int domainDimension() { return 4; }
     public double valueAt(double[] x) {
       double sum = 0.0;
       for (int i=0; i= 0.3
     ineqConstraints[1] = new ComponentMinimumConstraint(2,0.5); // x2 >= 0.5
 
     DiffFunction[] noConstraints = new DiffFunction[0];
 
     double[] initial = {0.25, 0.25, 0.25, 0.25}; // note that it's not actual feasible
 
     // unconstrained minimization
     double[] x = unconstrainedMinimizer.minimize(objective, 1e-4, initial);
     System.out.println("Unconstrained minimum is :            "+objective.valueAt(x)+" at "+arrayToString(x));
 
     // with equality constraints
     double[] xEQ = constrainedMinimizer.minimize(objective, 1e-4, eqConstraints, 1e-8, noConstraints, 0.0, initial);
     System.out.println("Equality-conconstrained minimum is :  "+objective.valueAt(xEQ)+" at "+arrayToString(xEQ));
     
     // with inequality constraints
     double[] xINEQ = constrainedMinimizer.minimize(objective, 1e-4, noConstraints, 0, ineqConstraints, 1e-8, initial);
     System.out.println("Inequality-conconstrained minimum is :"+objective.valueAt(xINEQ)+" at "+arrayToString(xINEQ));
     
     // with all constraints
     double[] xBOTH = constrainedMinimizer.minimize(objective, 1e-4, eqConstraints, 1e-8, ineqConstraints, 1e-8, initial);
     System.out.println("Mixed-conconstrained minimum is :     "+objective.valueAt(xBOTH)+" at "+arrayToString(xBOTH));
     
   }
 }
 

Since:

1.0

Constructor Summary

MinimizationExample()

Method Summary

static void

main(String[] args)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

MinimizationExample

public MinimizationExample()

Method Detail

main

public static void main(String[] args)