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mathematics.h

Go to the documentation of this file.

//FILE:         mathematics.h
//AUTHOR:       Nathan Cournia <nathan@cournia.com>
#ifndef COURNIA_MATHEMATICS_H
#define COURNIA_MATHEMATICS_H 1 

typedef float real_t;

#include <cstdlib>
#include <cmath>

//#define MATH_EPSILON 1.19209290e-07f
#define MATH_EPSILON 0.00001

namespace math {

inline double
rand01( void ) 
{
        return (rand( ) / (double)RAND_MAX);
}


inline double
to_degrees( double x )
{
        return (x * 180.0 / M_PI);
}


inline double
to_radians( double x )
{
        return (x * M_PI / 180.0);
}


inline bool
equals( double x, double y ) 
{
        return (std::fabs( x - y ) < MATH_EPSILON);
}


template <class T>
inline void
swap( T& x, T& y )
{
        T z = x;
        x = y;
        y = z;
}


inline double
sign( double x )
{
        if( x < 0.0 ) {
                return -1.0;
        } else {
                return 1.0;
        }
}


inline bool
same_sign( double x, double y )
{
        if( x * y >= 0.0 ) {
                return true;
        } else {
                return false;
        }
}


inline bool
negative( double x )
{
        if( x < 0.0 ) {
                return true;
        } else {
                return false;
        }
}


inline bool
positive( double x )
{
        if( x < 0.0 ) {
                return false;
        } else {
                return true;
        }
}

} //end of namespace math

#endif

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