Package ca.nengo.math.impl

Examples of ca.nengo.math.impl.Polynomial

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  /*
   * Test method for 'ca.nengo.math.impl.LinearCurveFitter.fit()'
   */
  public void testFindCoefficients() {
    Function target = new Polynomial(new float[]{1f,4f,-3f,0.5f});
    CurveFitter lcf = new LinearCurveFitter();
    float[][] values = new float[2][10];
   
    for (int i=0; i<values[0].length; i++) {
      values[0][i] = -9 + i * 2;
      values[1][i] = target.map(new float[]{values[0][i]});
    }
   
    Function fitted = lcf.fit(values[0], values[1]);
   
//    Plotter.plot(target, -10, 0.1f, 10, "target");
//    Plotter.plot(fitted, -10, 0.5f, 10, "fitted");
   
    float targetVal = 0f;
    float fittedVal = 0f;
    for (int i=-8; i<9; i=i+2) {
      targetVal = target.map(new float[]{i});
      fittedVal = fitted.map(new float[]{i});
      TestUtil.assertClose(targetVal, fittedVal, 15f);
    }
 
  }
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  /*
   * Test method for 'ca.nengo.math.impl.Polynomial.getDimension()'
   */
  public void testGetDimension() {
    Polynomial f = new Polynomial(new float[]{-1,0,1,2});
    assertEquals(1, f.getDimension());
  }
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  /*
   * Test method for 'ca.nengo.math.impl.Polynomial.map(float[])'
   */
  public void testMap() {
    Polynomial f = new Polynomial(new float[]{-1,0,2,1});
    TestUtil.assertClose(2, f.map(new float[]{1}), .00001f);
    TestUtil.assertClose(15, f.map(new float[]{2}), .00001f);
    TestUtil.assertClose(-1, f.map(new float[]{-2}), .00001f);
    TestUtil.assertClose(-1, f.map(new float[]{0}), .00001f);
  }
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  /*
   * Test method for 'ca.nengo.math.impl.Polynomial.multiMap(float[][])'
   */
  public void testMultiMap() {
    Polynomial f = new Polynomial(new float[]{-1,0,2,-1});

    float[] values = f.multiMap(new float[][]{new float[]{3}, new float[]{-2}});
    TestUtil.assertClose(-10, values[0], .00001f);
    TestUtil.assertClose(15, values[1], .00001f);
  }
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    try {
      root = nrf.findRoot(func, -5, 15, 0.0001f);
    } catch (RuntimeException e) { // failure after too many attempts
    }
   
    func = new Polynomial(new float[]{4f, 2f, -3f, 1f});
    root = nrf.findRoot(func, -5, 15, 0.0001f);
    TestUtil.assertClose(func.map(new float[]{root}), 0, 0.001f);
   
    func = new SigmoidFunction(-1f, 0.3f, -0.5f, 1f);
    root = nrf.findRoot(func, -5, 5, 0.0001f);
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Related Classes of ca.nengo.math.impl.Polynomial

  • ca.nengo.math.impl.LinearCurveFitterTest
  • ca.nengo.math.impl.NewtonRootFinderTest
  • ca.nengo.math.impl.PolynomialTest
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