/usr/include/tnt/tnt_math_utils.h is in libtnt-dev 1.2.6-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 | #ifndef MATH_UTILS_H
#define MATH_UTILS_H
/* needed for sqrt() below */
#include <math.h>
namespace TNT
{
/**
@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);
}
}
/**
@returns the minimum of scalars a and b.
*/
template <class Scalar>
Scalar min(const Scalar &a, const Scalar &b)
{
return a < b ? a : b;
}
/**
@returns the maximum of scalars a and b.
*/
template <class Scalar>
Scalar max(const Scalar &a, const Scalar &b)
{
return a > b ? a : b;
}
/**
@returns the absolute value of a real (no-complex) scalar.
*/
template <class Real>
Real abs(const Real &a)
{
return (a > 0 ? a : -a);
}
} /* TNT namespace */
#endif
/* MATH_UTILS_H */
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