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tnt_math_utils.h

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#ifndef MATH_UTILS_H
#define MATH_UTILS_H

#include <math.h>
/* needed for sqrt() below */



namespace TNT
{
template <class Real>
Real hypot(const Real &a, const Real &b)
{
        
        if (a== 0)
                return abs(b);
        else
        {
                Real c = b/a;
                return abs(a) * sqrt(1 + c*c);
        }
}

template <class Scalar>
Scalar min(const Scalar &a, const Scalar &b)
{
        return  a < b ? a : b;
}

template <class Scalar>
Scalar max(const Scalar &a, const Scalar &b)
{
        return  a > b ? a : b;
}

template <class Real>
Real abs(const Real &a)
{
        return  (a > 0 ? a : -a);
}

}




#endif
/* MATH_UTILS_H */

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