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

Besinud() Function Besinud ( Nu As  Double, X As  Double, Optional Info As  Long  ) Derivative I'ν(x) of modified Bessel function of the first kind of order ν Iν(x) (fractional order) Purpose Computes the derivative I'ν(x) of the modified Bessel function of the first kind of order ν Iν(x). Returns Double The derivative I'ν(x) of the modified Bessel function of the first kind of order ν Iν(x). Parameters [in] Nu Order ν. [in] X Argument x. (X >= 0 if ν is not an integer) [out] Info (Optional) = 0: Successful exit. = -2: The argument X had an illegal value. (X < 0 when ν is not an integer) = 1: Floating point range error. Reference boost/math/special_functions