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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.math3.distribution;
import org.apache.commons.math3.exception.OutOfRangeException;
/**
* Implementation of the constant real distribution.
*
* @since 3.4
*/
public class ConstantRealDistribution extends AbstractRealDistribution {
/** Serialization ID */
private static final long serialVersionUID = -4157745166772046273L;
/** Constant value of the distribution */
private final double value;
/**
* Create a constant real distribution with the given value.
*
* @param value the constant value of this distribution
*/
public ConstantRealDistribution(double value) {
super(null); // Avoid creating RandomGenerator
this.value = value;
}
/** {@inheritDoc} */
public double density(double x) {
return x == value ? 1 : 0;
}
/** {@inheritDoc} */
public double cumulativeProbability(double x) {
return x < value ? 0 : 1;
}
/** {@inheritDoc} */
@Override
public double inverseCumulativeProbability(final double p) throws OutOfRangeException {
if (p < 0.0 || p > 1.0) {
throw new OutOfRangeException(p, 0, 1);
}
return value;
}
/** {@inheritDoc} */
public double getNumericalMean() {
return value;
}
/** {@inheritDoc} */
public double getNumericalVariance() {
return 0;
}
/** {@inheritDoc} */
public double getSupportLowerBound() {
return value;
}
/** {@inheritDoc} */
public double getSupportUpperBound() {
return value;
}
/** {@inheritDoc} */
public boolean isSupportLowerBoundInclusive() {
return true;
}
/** {@inheritDoc} */
public boolean isSupportUpperBoundInclusive() {
return true;
}
/** {@inheritDoc} */
public boolean isSupportConnected() {
return true;
}
/** {@inheritDoc} */
@Override
public double sample() {
return value;
}
/**
* Override with no-op (there is no generator).
*
* @param seed (ignored)
*/
@Override
public void reseedRandomGenerator(long seed) {}
}
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