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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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package org.apache.commons.math.ode.sampling;
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import org.apache.commons.math.ode.DerivativeException;
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* This interface represents a handler that should be called after
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* each successful fixed step.
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* <p>This interface should be implemented by anyone who is interested
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* in getting the solution of an ordinary differential equation at
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* fixed time steps. Objects implementing this interface should be
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* wrapped within an instance of {@link StepNormalizer} that itself
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* is used as the general {@link StepHandler} by the integrator. The
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* {@link StepNormalizer} object is called according to the integrator
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* internal algorithms and it calls objects implementing this
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* interface as necessary at fixed time steps.</p>
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* @version $Revision: 785473 $ $Date: 2009-06-17 00:02:35 -0400 (Wed, 17 Jun 2009) $
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public interface FixedStepHandler {
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* Handle the last accepted step
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* @param t time of the current step
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* @param y state vector at t. For efficiency purposes, the {@link
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* StepNormalizer} class reuses the same array on each call, so if
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* the instance wants to keep it across all calls (for example to
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* provide at the end of the integration a complete array of all
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* steps), it should build a local copy store this copy.
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* @param yDot derivatives of the state vector state vector at t.
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* For efficiency purposes, the {@link StepNormalizer} class reuses
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* the same array on each call, so if
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* the instance wants to keep it across all calls (for example to
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* provide at the end of the integration a complete array of all
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* steps), it should build a local copy store this copy.
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* @param isLast true if the step is the last one
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* @throws DerivativeException if some error condition is encountered
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public void handleStep(double t, double[] y, double[] yDot, boolean isLast)
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throws DerivativeException;