MapFunction.cpp
/*
* Copyright (C) 2010 Regents of the University of Michigan
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "MapFunction.h"
#include "MathConstant.h"
#include <math.h>
double DistanceToRecombination(double distance)
{
return (1.0 - exp(-2.0 * distance)) * 0.5;
}
double RecombinationToDistance(double recombination)
{
return (log(max(1.0 - 2 * recombination, 1e-7)) * -0.5);
}
double KosambiDistanceToRecombination(double distance)
{
double e_to_4x = exp(4.0 * distance);
return (0.5 *(e_to_4x - 1.0) / (e_to_4x + 1.0));
}
double RecombinationToKosambiDistance(double theta)
{
return 0.25 * log((1.0 + 2*theta) / max(1.0 - 2.0*theta, 1e-7));
}