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Posted to commits@commons.apache.org by lu...@apache.org on 2007/10/26 15:59:51 UTC
svn commit: r588650 -
/commons/proper/math/trunk/src/test/org/apache/commons/math/ode/ContinuousOutputModelTest.java
Author: luc
Date: Fri Oct 26 06:59:51 2007
New Revision: 588650
URL: http://svn.apache.org/viewvc?rev=588650&view=rev
Log:
improved test coverage
Modified:
commons/proper/math/trunk/src/test/org/apache/commons/math/ode/ContinuousOutputModelTest.java
Modified: commons/proper/math/trunk/src/test/org/apache/commons/math/ode/ContinuousOutputModelTest.java
URL: http://svn.apache.org/viewvc/commons/proper/math/trunk/src/test/org/apache/commons/math/ode/ContinuousOutputModelTest.java?rev=588650&r1=588649&r2=588650&view=diff
==============================================================================
--- commons/proper/math/trunk/src/test/org/apache/commons/math/ode/ContinuousOutputModelTest.java (original)
+++ commons/proper/math/trunk/src/test/org/apache/commons/math/ode/ContinuousOutputModelTest.java Fri Oct 26 06:59:51 2007
@@ -76,6 +76,99 @@
}
+ public void testModelsMerging()
+ throws DerivativeException, IntegratorException {
+
+ // theoretical solution: y[0] = cos(t), y[1] = sin(t)
+ FirstOrderDifferentialEquations problem =
+ new FirstOrderDifferentialEquations() {
+ public void computeDerivatives(double t, double[] y, double[] dot)
+ throws DerivativeException {
+ dot[0] = -y[1];
+ dot[1] = y[0];
+ }
+ public int getDimension() {
+ return 2;
+ }
+ };
+
+ // integrate backward from π to 0;
+ ContinuousOutputModel cm1 = new ContinuousOutputModel();
+ FirstOrderIntegrator integ1 =
+ new DormandPrince853Integrator(0, 1.0, 1.0e-8, 1.0e-8);
+ integ1.setStepHandler(cm1);
+ integ1.integrate(problem, Math.PI, new double[] { -1.0, 0.0 },
+ 0, new double[2]);
+
+ // integrate backward from 2π to π
+ ContinuousOutputModel cm2 = new ContinuousOutputModel();
+ FirstOrderIntegrator integ2 =
+ new DormandPrince853Integrator(0, 0.1, 1.0e-12, 1.0e-12);
+ integ2.setStepHandler(cm2);
+ integ2.integrate(problem, 2.0 * Math.PI, new double[] { 1.0, 0.0 },
+ Math.PI, new double[2]);
+
+ // merge the two half circles
+ ContinuousOutputModel cm = new ContinuousOutputModel();
+ cm.append(cm2);
+ cm.append(new ContinuousOutputModel());
+ cm.append(cm1);
+
+ // check circle
+ assertEquals(2.0 * Math.PI, cm.getInitialTime(), 1.0e-12);
+ assertEquals(0, cm.getFinalTime(), 1.0e-12);
+ assertEquals(cm.getFinalTime(), cm.getInterpolatedTime(), 1.0e-12);
+ for (double t = 0; t < 2.0 * Math.PI; t += 0.1) {
+ cm.setInterpolatedTime(t);
+ double[] y = cm.getInterpolatedState();
+ assertEquals(Math.cos(t), y[0], 1.0e-7);
+ assertEquals(Math.sin(t), y[1], 1.0e-7);
+ }
+
+ }
+
+ public void testErrorConditions()
+ throws DerivativeException {
+
+ ContinuousOutputModel cm = new ContinuousOutputModel();
+ cm.handleStep(buildInterpolator(0, new double[] { 0.0, 1.0, -2.0 }, 1), true);
+
+ // dimension mismatch
+ assertTrue(checkAppendError(cm, 1.0, new double[] { 0.0, 1.0 }, 2.0));
+
+ // hole between time ranges
+ assertTrue(checkAppendError(cm, 10.0, new double[] { 0.0, 1.0, -2.0 }, 20.0));
+
+ // propagation direction mismatch
+ assertTrue(checkAppendError(cm, 1.0, new double[] { 0.0, 1.0, -2.0 }, 0.0));
+
+ // no errors
+ assertFalse(checkAppendError(cm, 1.0, new double[] { 0.0, 1.0, -2.0 }, 2.0));
+
+ }
+
+ private boolean checkAppendError(ContinuousOutputModel cm,
+ double t0, double[] y0, double t1)
+ throws DerivativeException {
+ try {
+ ContinuousOutputModel otherCm = new ContinuousOutputModel();
+ otherCm.handleStep(buildInterpolator(t0, y0, t1), true);
+ cm.append(otherCm);
+ } catch(IllegalArgumentException iae) {
+ //expected behavior
+ return true;
+ }
+ return false;
+ }
+
+ private StepInterpolator buildInterpolator(double t0, double[] y0, double t1) {
+ DummyStepInterpolator interpolator = new DummyStepInterpolator(y0, t1 >= t0);
+ interpolator.storeTime(t0);
+ interpolator.shift();
+ interpolator.storeTime(t1);
+ return interpolator;
+ }
+
public void checkValue(double value, double reference) {
assertTrue(Math.abs(value - reference) < 1.0e-10);
}