clamp.hpp

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#ifndef MLPACK_CORE_MATH_CLAMP_HPP
#define MLPACK_CORE_MATH_CLAMP_HPP

#include <stdlib.h>
#include <math.h>
#include <float.h>

namespace mlpack {
namespace math  {

inline double ClampNonNegative(const double d)
{
  return (d + fabs(d)) / 2;
}

inline double ClampNonPositive(const double d)
{
  return (d - fabs(d)) / 2;
}

inline double ClampRange(double value,
                         const double rangeMin,
                         const double rangeMax)
{
  value -= rangeMax;
  value = ClampNonPositive(value) + rangeMax;
  value -= rangeMin;
  value = ClampNonNegative(value) + rangeMin;
  return value;
}

} // namespace math
} // namespace mlpack

#endif // MLPACK_CORE_MATH_CLAMP_HPP