_besi0 _besi0e _besi1 _besi1e _besin _besind _besinu _besinud _besk0 _besk0e _besk1 _besk1e _beskn _besknd _besknu _besknud _cbesi _cbesk _sbesin _sbesinu _sbeskn _sbesknu

_besin() double _besin ( int  n, double  x  ) Modified Bessel function of the first kind of order n In(x) Purpose besin computes the modified Bessel function of the first kind of order n In(x). Returns Modified Bessel function of the first kind of order n In(x). Parameters [in] n Order n. [in] x Argument x. Error handling Range error (ERANGE) may occur. Reference boost/math/special_functions