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BetaDistribution.hpp
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BetaDistribution.hpp
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//
// BetaPDF.hpp
// MasterCollection
//
// Created by Will Zhang on 8/3/16.
// Copyright © 2016 Will Zhang. All rights reserved.
//
#ifndef BetaPDF_hpp
#define BetaPDF_hpp
#include <math.h>
class beta_PDF
{
private:
int is_physical = 0; //bool if there is baseline, aka d > 0
public:
double lowerbound;
double normalizing_constant;
double alpham1;
double betam1;
double betaexponent;
void set_parameters(double mean, double stdev, double lb, double ub);
beta_PDF();
beta_PDF(double mean, double stdev, double lb, double ub):lowerbound{lb}
{ set_parameters(mean, stdev, lb, ub);}
double PDF(double x);
};
const double M_PI_SQRT12 = M_PI_2/sqrt(3.0); /* Pi/sqrt(12) */
const double M_BETAMax = 3.20484408857591466767602498042342210; /* Beta(23/8) */
const double M_LOG_PI = log(M_PI); /* Beta(23/8) */
class beta_ODF
{
public:
beta_ODF(){}
beta_ODF(double mean, double stdev)
{
mu = mean;
set_baseline(stdev);
alpha = find_alpha(sigma);
alpha_m_1 = alpha - 1.0;
set_betaexponent(alpha);
}
void set_parameters(double mean, double stdev)
{
mu = mean;
set_baseline(stdev);
}
void set_baseline(double stdev);
double find_sigma(double stdev, double d);
double find_alpha(double std);
void set_betaexponent(double alpha);
// Output function
double ODF(double theta);
//private:
int is_isotropic = 0; //bool if the standard deviation exceed the maximum possible PI/sqrt(12.0), or is lower than the minimum 1.0e-4 (i.e. is approximately a delta function)
int has_baseline = 0; //bool if there is baseline, aka d > 0
double const_value = M_1_PI; //returns this values if is_isotropic is true
double mu = 0.0;
double sigma = 0.3;
double d = 0.0;
double alpha = 13.207783890401885;
double alpha_m_1 = 12.207783890401885;
double betaexponent = 17.180575633615234;
};
#endif /* BetaPDF_hpp */