WBesi WBesid WBesk WBeskd WSbesi WSbesk

WBesid() Function WBesid ( X As  Double, Nu As  Double  ) Derivative I'ν(x) of modified Bessel function of the first kind of order ν Iν(x) (fractional order) Purpose WBesid computes the derivative I'ν(x) of the modified Bessel function of the first kind of order ν Iν(x). Returns I'ν(x). Parameters [in] X Argument x. (X >= 0 if ν is not an integer) [in] Nu Order ν. Reference boost/math/special_functions