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package de.lmu.ifi.dbs.elki.math.statistics.distribution;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.AbstractParameterizer;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.OptionID;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.parameterization.Parameterization;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.parameters.DoubleParameter;
/*
This file is part of ELKI:
Environment for Developing KDD-Applications Supported by Index-Structures
Copyright (C) 2015
Ludwig-Maximilians-Universität München
Lehr- und Forschungseinheit für Datenbanksysteme
ELKI Development Team
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* Pseudo distribution, that has a unique constant value.
*
* @author Erich Schubert
*/
public class ConstantDistribution implements Distribution {
/**
* The constant
*/
final double c;
/**
* Constructor.
*
* @param c Constant
*/
public ConstantDistribution(double c) {
super();
this.c = c;
}
@Override
public double nextRandom() {
return c;
}
@Override
public double pdf(double val) {
return (val == c) ? 1 : 0;
}
@Override
public double cdf(double val) {
return (c < val) ? 0. : (c > val) ? 1. : .5;
}
@Override
public double quantile(double val) {
return c;
}
/**
* Parameterization class
*
* @author Erich Schubert
*
* @apiviz.exclude
*/
public static class Parameterizer extends AbstractParameterizer {
/**
* Constant value parameter
*/
public static final OptionID CONSTANT_ID = new OptionID("distribution.constant", "Constant value.");
/** Parameters. */
double constant;
@Override
protected void makeOptions(Parameterization config) {
super.makeOptions(config);
DoubleParameter constP = new DoubleParameter(CONSTANT_ID);
if (config.grab(constP)) {
constant = constP.doubleValue();
}
}
@Override
protected ConstantDistribution makeInstance() {
return new ConstantDistribution(constant);
}
}
}
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