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