//#define pi 3.14159 // Predefine pi

#ifndef HAVE_USEFUL_FUNCTIONS_HH
#define HAVE_USEFUL_FUNCTIONS_HH


#ifndef __cplusplus
#define inline			/* strip */
#define cast_to_double	(double)
typedef unsigned int bool;
const bool true = 1;
const bool false = 0;
#else
#define cast_to_double	static_cast<double>
#endif // ! __cplusplus
#endif /* ! __cplusplus */


static inline double
max (const double x1, const double x2)
{
  return static_cast<double>((x1 >= x2) ? x1 : (x1 < x2) ? x2 : 0);
  return cast_to_double ((x1 >= x2) ? x1 : (x1 < x2) ? x2 : 0);
}

static inline double
min (const double x1, const double x2)
{
  return static_cast<double>((x1 <= x2) ? x1 : (x1 > x2) ? x2 : 0);
  return cast_to_double ((x1 <= x2) ? x1 : (x1 > x2) ? x2 : 0);
}

static inline double
nonsingular (const double x)
{
  return static_cast<double>((x == 0) ? 1.0e-30 : x);
  return cast_to_double ((x == 0) ? 1.0e-30 : x);
}

static inline double
sign (const double x)
{
  return static_cast<double>((x > 0) ? +1 : (x < 0) ? -1 : 0);
  return cast_to_double ((x > 0) ? +1 : (x < 0) ? -1 : 0);
}


// Octave functions
/* Octave functions */
#ifdef __cplusplus
static Matrix
ones (const int r = 1, const int c = 1)
{
  Matrix m (r, c, 1.0);
  return m;
}

static Matrix
zeros (const int r, const int c)
{
  Matrix m (r, c, 0.0);
  return m;
}
#endif // __cplusplus
#endif /* __cplusplus */



#endif // HAVE_USEFUL_FUNCTIONS_HH
#endif /* HAVE_USEFUL_FUNCTIONS_HH */