| /* |
| * 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.analysis; |
| |
| import org.apache.commons.math.FunctionEvaluationException; |
| import org.apache.commons.math.util.FastMath; |
| |
| |
| |
| /** |
| * Base class for {@link BivariateRealFunction} that can be composed with other functions. |
| * |
| * @since 2.1 |
| * @version $Revision: 1073498 $ $Date: 2011-02-22 21:57:26 +0100 (mar. 22 févr. 2011) $ |
| * @deprecated in 2.2 |
| */ |
| @Deprecated |
| public abstract class BinaryFunction implements BivariateRealFunction { |
| |
| /** The + operator method wrapped as a {@link BinaryFunction}. */ |
| public static final BinaryFunction ADD = new BinaryFunction() { |
| /** {@inheritDoc} */ |
| @Override |
| public double value(double x, double y) { |
| return x + y; |
| } |
| }; |
| |
| /** The - operator method wrapped as a {@link BinaryFunction}. */ |
| public static final BinaryFunction SUBTRACT = new BinaryFunction() { |
| /** {@inheritDoc} */ |
| @Override |
| public double value(double x, double y) { |
| return x - y; |
| } |
| }; |
| |
| /** The * operator method wrapped as a {@link BinaryFunction}. */ |
| public static final BinaryFunction MULTIPLY = new BinaryFunction() { |
| /** {@inheritDoc} */ |
| @Override |
| public double value(double x, double y) { |
| return x * y; |
| } |
| }; |
| |
| /** The / operator method wrapped as a {@link BinaryFunction}. */ |
| public static final BinaryFunction DIVIDE = new BinaryFunction() { |
| /** {@inheritDoc} */ |
| @Override |
| public double value(double x, double y) { |
| return x / y; |
| } |
| }; |
| |
| /** The {@code FastMath.pow} method wrapped as a {@link BinaryFunction}. */ |
| public static final BinaryFunction POW = new BinaryFunction() { |
| /** {@inheritDoc} */ |
| @Override |
| public double value(double x, double y) { |
| return FastMath.pow(x, y); |
| } |
| }; |
| |
| /** The {@code FastMath.atan2} method wrapped as a {@link BinaryFunction}. */ |
| public static final BinaryFunction ATAN2 = new BinaryFunction() { |
| /** {@inheritDoc} */ |
| @Override |
| public double value(double x, double y) { |
| return FastMath.atan2(x, y); |
| } |
| }; |
| |
| /** {@inheritDoc} */ |
| public abstract double value(double x, double y) throws FunctionEvaluationException; |
| |
| /** Get a composable function by fixing the first argument of the instance. |
| * @param fixedX fixed value of the first argument |
| * @return a function such that {@code f.value(y) == value(fixedX, y)} |
| */ |
| public ComposableFunction fix1stArgument(final double fixedX) { |
| return new ComposableFunction() { |
| @Override |
| /** {@inheritDoc} */ |
| public double value(double x) throws FunctionEvaluationException { |
| return BinaryFunction.this.value(fixedX, x); |
| } |
| }; |
| } |
| |
| /** Get a composable function by fixing the second argument of the instance. |
| * @param fixedY fixed value of the second argument |
| * @return a function such that {@code f.value(x) == value(x, fixedY)} |
| */ |
| public ComposableFunction fix2ndArgument(final double fixedY) { |
| return new ComposableFunction() { |
| @Override |
| /** {@inheritDoc} */ |
| public double value(double x) throws FunctionEvaluationException { |
| return BinaryFunction.this.value(x, fixedY); |
| } |
| }; |
| } |
| |
| } |