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65 lines
1.9 KiB
C++
65 lines
1.9 KiB
C++
// $Id: uniformDistribution.cpp 2712 2007-11-19 14:50:12Z itaymay $
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#include "uniformDistribution.h"
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uniformDistribution::uniformDistribution(const int numOfCategories, MDOUBLE lowerBound,
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MDOUBLE upperBound) :distribution() {
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_globalRate=1.0;
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setUniformParameters(numOfCategories, lowerBound, upperBound);
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}
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//copy constructor
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uniformDistribution::uniformDistribution(const uniformDistribution& other) :
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_rates(other._rates),
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_ratesProb(other._ratesProb),
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_globalRate(other._globalRate),
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_interval(other._interval),
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_upperBound(other._upperBound),
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_lowerBound(other._lowerBound)
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{
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}
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void uniformDistribution::setUniformParameters(const int number_of_categories,
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MDOUBLE lowerBound, MDOUBLE upperBound){
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_upperBound = upperBound;
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_lowerBound = lowerBound;
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_interval = ((upperBound - lowerBound) / (number_of_categories+0.0));
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_rates.clear();
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_rates.resize(number_of_categories);
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_ratesProb.erase(_ratesProb.begin(),_ratesProb.end());
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_ratesProb.resize(number_of_categories, 1.0/number_of_categories);
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//setting _rates[i] as the middle value of each category
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for (int i = 0; i < number_of_categories; ++i) {
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_rates[i] = _lowerBound + (_interval * (i + 0.5));
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}
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}
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//returns the ith border between categories
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//getBorder(0) = _lowerBound, getBorder(categories()) = _upperBound
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MDOUBLE uniformDistribution::getBorder(int i) const {
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return (i == categories()) ? _upperBound : (_rates[i] - (_interval/2));
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}
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const MDOUBLE uniformDistribution::getCumulativeProb(const MDOUBLE x) const
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{
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if (x<_lowerBound)
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return 0;
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else if (x>= _upperBound)
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return 1;
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else
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return ((x-_lowerBound) / (_upperBound - _lowerBound));
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}
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void uniformDistribution::change_number_of_categories(int in_number_of_categories)
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{
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if (in_number_of_categories == categories())
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return;
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setUniformParameters(in_number_of_categories, _lowerBound, _upperBound);
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}
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