/*
* Created on 28-Jul-2006
*/
package ca.nengo.util.impl;
import ca.nengo.TestUtil;
import ca.nengo.util.VectorGenerator;
import ca.nengo.util.impl.RandomHypersphereVG;
import junit.framework.TestCase;
/**
* Unit tests for RandomHypersphereVG.
*
* @author Bryan Tripp
*/
public class RandomHypersphereVGTest extends TestCase {
/*
* Test method for 'ca.nengo.util.impl.RandomHypersphereVG.genVectors(int, int)'
*/
public void testGenVectors() {
VectorGenerator vg = null;
vg = new RandomHypersphereVG(true, 1f, 1f);
float[][] v = vg.genVectors(10, 3);
for (int i = 0; i < v.length; i++) {
float radius = (float) Math.pow(v[i][0]*v[i][0] + v[i][1]*v[i][1] + v[i][2]*v[i][2], .5);
TestUtil.assertClose(1f, radius, .0001f);
}
vg = new RandomHypersphereVG(true, 1f, 0f);
v = vg.genVectors(10, 3);
for (int i = 0; i < v.length; i++) {
float radius = (float) Math.pow(v[i][0]*v[i][0] + v[i][1]*v[i][1] + v[i][2]*v[i][2], .5);
TestUtil.assertClose(1f, radius, .0001f);
}
vg = new RandomHypersphereVG(true, 1f, .5f);
v = vg.genVectors(10, 3);
for (int i = 0; i < v.length; i++) {
float radius = (float) Math.pow(v[i][0]*v[i][0] + v[i][1]*v[i][1] + v[i][2]*v[i][2], .5);
TestUtil.assertClose(1f, radius, .0001f);
}
vg = new RandomHypersphereVG(false, 1f, 1f);
v = vg.genVectors(10, 3);
for (int i = 0; i < v.length; i++) {
float radius = (float) Math.pow(v[i][0]*v[i][0] + v[i][1]*v[i][1] + v[i][2]*v[i][2], .5);
assertTrue(radius < 1f);
}
vg = new RandomHypersphereVG(true, 2f, 1f);
v = vg.genVectors(10, 3);
for (int i = 0; i < v.length; i++) {
float radius = (float) Math.pow(v[i][0]*v[i][0] + v[i][1]*v[i][1] + v[i][2]*v[i][2], .5);
TestUtil.assertClose(2f, radius, .0001f);
}
vg = new RandomHypersphereVG(true, 1f, 1f);
v = vg.genVectors(10, 3);
for (int i = 0; i < v.length; i++) {
TestUtil.assertClose(1f, Math.abs(v[i][0]) + Math.abs(v[i][1]) + Math.abs(v[i][2]), .0001f);
}
}
}