46 lines
1.5 KiB
C++
46 lines
1.5 KiB
C++
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef tptmath_h
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#define tptmath_h
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// This file is used for EMP, to simulate many EMP going off at once at the end of the frame
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#include <cmath>
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namespace Probability
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{
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// X ~ binomial(n,p), returns P(X>=1)
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// e.g. If a reaction has n chances of occurring, each time with probability p, this returns the probability that it occurs at least once.
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float binomial_gte1(int n, float p);
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float randFloat();
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class SmallKBinomialGenerator
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{
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protected:
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float *cdf;
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unsigned int maxK;
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public:
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// Class to generate numbers from a binomial distribution, up to a maximum value (maxK).
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// Results which would have been above maxK return maxK.
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// Note: maxK must be small, otherwise the method used in this class is inefficient. (n and p can be any valid value)
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SmallKBinomialGenerator(unsigned int n, float p, unsigned int maxK_);
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~SmallKBinomialGenerator();
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unsigned int calc(float randFloat);
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};
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}
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#endif
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