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Diffstat (limited to 'src/main/java/org/apache/commons/math3/distribution/ConstantRealDistribution.java')
-rw-r--r-- | src/main/java/org/apache/commons/math3/distribution/ConstantRealDistribution.java | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/src/main/java/org/apache/commons/math3/distribution/ConstantRealDistribution.java b/src/main/java/org/apache/commons/math3/distribution/ConstantRealDistribution.java new file mode 100644 index 0000000..93ba255 --- /dev/null +++ b/src/main/java/org/apache/commons/math3/distribution/ConstantRealDistribution.java @@ -0,0 +1,112 @@ +/* + * 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) {} +} |