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# Java example source code file (GradientFunctionTest.java)

This example Java source code file (GradientFunctionTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

## The GradientFunctionTest.java Java example source code

```/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements.  See the NOTICE file distributed with
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License.  You may obtain a copy of the License at
*
*
* Unless required by applicable law or agreed to in writing, software
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
*/

package org.apache.commons.math3.analysis.differentiation;

import org.apache.commons.math3.TestUtils;
import org.apache.commons.math3.exception.DimensionMismatchException;
import org.apache.commons.math3.exception.MathIllegalArgumentException;
import org.apache.commons.math3.util.FastMath;
import org.junit.Test;

/**
*/

@Test
public void test2DDistance() {
EuclideanDistance f = new EuclideanDistance();
for (double x = -10; x < 10; x += 0.5) {
for (double y = -10; y < 10; y += 0.5) {
double[] point = new double[] { x, y };
}
}
}

@Test
public void test3DDistance() {
EuclideanDistance f = new EuclideanDistance();
for (double x = -10; x < 10; x += 0.5) {
for (double y = -10; y < 10; y += 0.5) {
for (double z = -10; z < 10; z += 0.5) {
double[] point = new double[] { x, y, z };
}
}
}
}

private static class EuclideanDistance implements MultivariateDifferentiableFunction {

public double value(double[] point) {
double d2 = 0;
for (double x : point) {
d2 += x * x;
}
return FastMath.sqrt(d2);
}

public DerivativeStructure value(DerivativeStructure[] point)
throws DimensionMismatchException, MathIllegalArgumentException {
DerivativeStructure d2 = point[0].getField().getZero();
for (DerivativeStructure x : point) {
}
return d2.sqrt();
}

double d = value(point);
for (int i = 0; i < point.length; ++i) {
}
}

}

}
```

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