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#ifndef MATH_UTILS_H
#define MATH_UTILS_H
/* needed for abs(), sqrt() below */
#include <cmath>
namespace TNT
{
using namespace std;
/**
@returns hypotenuse of real (non-complex) scalars a and b by
avoiding underflow/overflow
using (a * sqrt( 1 + (b/a) * (b/a))), rather than
sqrt(a*a + b*b).
*/
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);
}
}
} /* TNT namespace */
#endif
/* MATH_UTILS_H */
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