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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.nonstiff;
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import org.apache.commons.math.ode.FirstOrderDifferentialEquations;
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import org.apache.commons.math.ode.events.EventHandler;
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public class StepProblem
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implements FirstOrderDifferentialEquations, EventHandler {
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public StepProblem(double rateBefore, double rateAfter,
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this.rateAfter = rateAfter;
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this.switchTime = switchTime;
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public void computeDerivatives(double t, double[] y, double[] yDot) {
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public int getDimension() {
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public void setRate(double rate) {
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public int eventOccurred(double t, double[] y, boolean increasing) {
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return RESET_DERIVATIVES;
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public double g(double t, double[] y) {
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return t - switchTime;
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public void resetState(double t, double[] y) {
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private double rateAfter;
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private double switchTime;
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private static final long serialVersionUID = 7590601995477504318L;