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/*******************************************************************************
** Entropy.h
** Part of the mutual information toolbox
**
** Contains functions to calculate the entropy of a single variable H(X),
** the joint entropy of two variables H(X,Y), and the conditional entropy
** H(X|Y)
**
** Author: Adam Pocock
** Created 19/2/2010
**
** Copyright 2010 Adam Pocock, The University Of Manchester
** www.cs.manchester.ac.uk
**
** This file is part of MIToolbox.
**
** MIToolbox is free software: you can redistribute it and/or modify
** it under the terms of the GNU Lesser General Public License as published by
** the Free Software Foundation, either version 3 of the License, or
** (at your option) any later version.
**
** MIToolbox 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 Lesser General Public License for more details.
**
** You should have received a copy of the GNU Lesser General Public License
** along with MIToolbox. If not, see <http://www.gnu.org/licenses/>.
**
*******************************************************************************/
#ifndef __Entropy_H
#define __Entropy_H
#ifdef __cplusplus
extern "C" {
#endif
/*******************************************************************************
** calculateEntropy returns the entropy in log base 2 of dataVector
** H(X)
**
** length(dataVector) == vectorLength otherwise there
** will be a segmentation fault
*******************************************************************************/
double calculateEntropy(double *dataVector, int vectorLength);
/*******************************************************************************
** calculateJointEntropy returns the entropy in log base 2 of the joint
** variable of firstVector and secondVector H(XY)
**
** length(firstVector) == length(secondVector) == vectorLength otherwise there
** will be a segmentation fault
*******************************************************************************/
double calculateJointEntropy(double *firstVector, double *secondVector, int vectorLength);
/*******************************************************************************
** calculateConditionalEntropy returns the entropy in log base 2 of dataVector
** conditioned on conditionVector, H(X|Y)
**
** length(dataVector) == length(conditionVector) == vectorLength otherwise there
** will be a segmentation fault
*******************************************************************************/
double calculateConditionalEntropy(double *dataVector, double *conditionVector, int vectorLength);
#ifdef __cplusplus
}
#endif
#endif
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