besi0 besi0e besi1 besi1e besin besind besinu besinud besk0 besk0e besk1 besk1e beskn besknd besknu besknud cbesi cbesk sbesin sbesinu sbeskn sbesknu

besi1() double besi1 ( double  x ) Modified Bessel functions of the first kind of order one I1(x) Purpose besi1 computes the modified Bessel function of the first kind of order one I1(x). Returns Modified Bessel functions of the first kind of order one I1(x). Parameters [in] x Argument x. Error handling Range error (ERANGE) may occur. Reference boost/math/special_functions