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Commons Math example source code file (EulerStepInterpolator.java)
The Commons Math EulerStepInterpolator.java source code/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * 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 * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.apache.commons.math.ode.nonstiff; import org.apache.commons.math.ode.DerivativeException; import org.apache.commons.math.ode.sampling.StepInterpolator; /** * This class implements a linear interpolator for step. * * <p>This interpolator computes dense output inside the last * step computed. The interpolation equation is consistent with the * integration scheme : * * <pre> * y(t_n + theta h) = y (t_n + h) - (1-theta) h y' * </pre> * * where theta belongs to [0 ; 1] and where y' is the evaluation of * the derivatives already computed during the step.</p> * * @see EulerIntegrator * @version $Revision: 809744 $ $Date: 2009-08-31 16:59:15 -0400 (Mon, 31 Aug 2009) $ * @since 1.2 */ class EulerStepInterpolator extends RungeKuttaStepInterpolator { /** Serializable version identifier */ private static final long serialVersionUID = -7179861704951334960L; /** Simple constructor. * This constructor builds an instance that is not usable yet, the * {@link * org.apache.commons.math.ode.sampling.AbstractStepInterpolator#reinitialize} * method should be called before using the instance in order to * initialize the internal arrays. This constructor is used only * in order to delay the initialization in some cases. The {@link * RungeKuttaIntegrator} class uses the prototyping design pattern * to create the step interpolators by cloning an uninitialized model * and later initializing the copy. */ public EulerStepInterpolator() { } /** Copy constructor. * @param interpolator interpolator to copy from. The copy is a deep * copy: its arrays are separated from the original arrays of the * instance */ public EulerStepInterpolator(final EulerStepInterpolator interpolator) { super(interpolator); } /** {@inheritDoc} */ @Override protected StepInterpolator doCopy() { return new EulerStepInterpolator(this); } /** {@inheritDoc} */ @Override protected void computeInterpolatedStateAndDerivatives(final double theta, final double oneMinusThetaH) throws DerivativeException { for (int i = 0; i < interpolatedState.length; ++i) { interpolatedState[i] = currentState[i] - oneMinusThetaH * yDotK[0][i]; } System.arraycopy(yDotK[0], 0, interpolatedDerivatives, 0, interpolatedDerivatives.length); } } Other Commons Math examples (source code examples)Here is a short list of links related to this Commons Math EulerStepInterpolator.java source code file: |
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