Besi0 Besi0_sub Besi1 Besi1_sub Besin Besin_sub Besind Besind_sub Besinu Besinu_sub Besinud Besinud_sub Besk0 Besk0_sub Besk1 Besk1_sub Beskn Beskn_sub Besknd Besknd_sub Besknu Besknu_sub Besknud Besknud_sub Cbesi Cbesk Sbesin Sbesin_sub Sbesinu Sbesinu_sub Sbeskn Sbeskn_sub Sbesknu Sbesknu_sub

Besind_sub() Sub Besind_sub ( Ret As  Double, N As  Long, X As  Double, Optional Info As  Long  ) Derivative I'n(x) of modified Bessel function of the first kind of order n In(x) (Subroutine version) Purpose Computes the derivative I'n(x) of the modified Bessel function of the first kind of order n In(x). Parameters [out] Ret The derivative I'n(x) of the modified Bessel function of the first kind of order n In(x). [in] N Order n. [in] X Argument x. [out] Info (Optional) = 0: Successful exit. = 1: Floating point range error. Reference boost/math/special_functions