src/math/Math.h
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 #ifndef __COGAPS_MATH_H__
 #define __COGAPS_MATH_H__
 
 #include <stdint.h>
 #include <string>
 #include <sstream>
 
 namespace gaps
 {
     const float epsilon = 1.0e-5f;
     const float pi = 3.1415926535897932384626433832795f;
     const float pi_double = 3.1415926535897932384626433832795;
     const float sqrt2 = 1.4142135623730950488016887242097f;
 
     float min(float a, float b);
     unsigned min(unsigned a, unsigned b);
     uint64_t min(uint64_t a, uint64_t b);
 
     float max(float a, float b);
     unsigned max(unsigned a, unsigned b);
     uint64_t max(uint64_t a, uint64_t b);
 
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     // distribution calculations (cdf, pdf, quantile)
     float d_gamma(float d, float shape, float scale);
     float p_gamma(float p, float shape, float scale);
     float q_gamma(float q, float shape, float scale);
     float d_norm(float d, float mean, float sd);
     float p_norm(float p, float mean, float sd);
     float q_norm(float q, float mean, float sd);
 
     double lgamma(double x);
 
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 } // namespace gaps
 
 #endif // __COGAPS_MATH_H__