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// $Id$ |
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/* |
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Copyright (C) 2023 Peter Johansson |
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This file is part of the yat library, https://dev.thep.lu.se/trac/yat |
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The yat library is free software; you can redistribute it and/or |
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modify it under the terms of the GNU General Public License as |
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published by the Free Software Foundation; either version 3 of the |
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License, or (at your option) any later version. |
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The yat library 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 GNU |
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General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with yat. If not, see <https://www.gnu.org/licenses/>. |
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*/ |
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#include <config.h> |
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#include "Likelihood.h" |
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#include <cassert> |
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#include <cmath> |
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#include <limits> |
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namespace theplu { |
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namespace yat { |
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namespace statistics { |
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Likelihood::Likelihood(long double x) |
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: ln_x_(std::log(x)) |
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{ |
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assert((x==0.0) == zero()); |
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} |
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double Likelihood::get(void) const |
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{ |
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return std::exp(ln_x_); |
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} |
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long double& Likelihood::log(void) |
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{ |
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return ln_x_; |
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} |
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const long double& Likelihood::log(void) const |
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{ |
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return ln_x_; |
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} |
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bool Likelihood::zero(void) const |
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{ |
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return std::isinf(ln_x_); |
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} |
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bool Likelihood::operator<(const Likelihood& rhs) const |
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{ |
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return ln_x_ < rhs.ln_x_; |
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} |
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bool Likelihood::operator==(const Likelihood& rhs) const |
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{ |
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return ln_x_ == rhs.ln_x_; |
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} |
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Likelihood& Likelihood::operator+=(const Likelihood& rhs) |
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{ |
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if (rhs.zero()) |
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return *this; |
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if (zero()) { |
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*this = rhs; |
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return *this; |
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} |
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|
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// C = A + B |
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// logC = log(A+B) = log(A * (1+B/A)) = logA + log(1+B/A) |
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if (ln_x_ > rhs.ln_x_) { |
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// ln B/A = lnB - lnA |
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// B/A = exp(lnB - lnA) |
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double epsilon = std::exp(rhs.ln_x_ - ln_x_); |
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assert(epsilon <= 1.0); |
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ln_x_ += std::log1p(epsilon); |
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} |
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else { |
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double epsilon = std::exp(ln_x_ - rhs.ln_x_); |
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assert(epsilon <= 1.0); |
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ln_x_ = rhs.ln_x_ + std::log1p(epsilon); |
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} |
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return *this; |
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} |
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Likelihood& Likelihood::operator*=(const Likelihood& rhs) |
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{ |
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ln_x_ += rhs.ln_x_; |
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return *this; |
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} |
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Likelihood& Likelihood::operator*=(double rhs) |
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{ |
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ln_x_ += std::log(rhs); |
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return *this; |
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} |
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Likelihood& Likelihood::operator/=(const Likelihood& rhs) |
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{ |
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ln_x_ -= rhs.ln_x_; |
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return *this; |
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} |
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Likelihood& Likelihood::operator/=(double rhs) |
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{ |
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ln_x_ -= std::log(rhs); |
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return *this; |
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} |
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Likelihood exp(double x) |
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{ |
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Likelihood L; |
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L.log() = x; |
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return L; |
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} |
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double log(const Likelihood& L) |
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{ |
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return L.log(); |
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} |
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Likelihood operator*(double x, const Likelihood& L) |
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{ |
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Likelihood result(L); |
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result.log() += std::log(x); |
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return result; |
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} |
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Likelihood operator*(const Likelihood& L, double x) |
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{ |
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return x * L; |
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} |
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Likelihood operator/(const Likelihood& L, double x) |
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{ |
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Likelihood result(L); |
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result.log() -= std::log(x); |
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return result; |
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} |
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Likelihood operator/(const Likelihood& num, const Likelihood& den) |
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{ |
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Likelihood result(num); |
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result /= den; |
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return result; |
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} |
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}}} // of namespace utility, yat, and thep |