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/*
* 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);
}
};
}
}
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