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Java example source code file (UnivariateFunction.java)

This example Java source code file (UnivariateFunction.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

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Java - Java tags/keywords

univariatefunction

The UnivariateFunction.java Java example 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.math3.analysis;

/**
 * An interface representing a univariate real function.
 * <p>
 * When a <em>user-defined function encounters an error during
 * evaluation, the {@link #value(double) value} method should throw a
 * <em>user-defined unchecked exception.

* <p> * The following code excerpt shows the recommended way to do that using * a root solver as an example, but the same construct is applicable to * ODE integrators or optimizers.</p> * * <pre> * private static class LocalException extends RuntimeException { * // The x value that caused the problem. * private final double x; * * public LocalException(double x) { * this.x = x; * } * * public double getX() { * return x; * } * } * * private static class MyFunction implements UnivariateFunction { * public double value(double x) { * double y = hugeFormula(x); * if (somethingBadHappens) { * throw new LocalException(x); * } * return y; * } * } * * public void compute() { * try { * solver.solve(maxEval, new MyFunction(a, b, c), min, max); * } catch (LocalException le) { * // Retrieve the x value. * } * } * </pre> * * As shown, the exception is local to the user's code and it is guaranteed * that Apache Commons Math will not catch it. * */ public interface UnivariateFunction { /** * Compute the value of the function. * * @param x Point at which the function value should be computed. * @return the value of the function. * @throws IllegalArgumentException when the activated method itself can * ascertain that a precondition, specified in the API expressed at the * level of the activated method, has been violated. * When Commons Math throws an {@code IllegalArgumentException}, it is * usually the consequence of checking the actual parameters passed to * the method. */ double value(double x); }

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