ecld.gamma is the wrapper for incomplete gamma function
\(\Gamma(s,x)\). It is mainly to wrap around pgamma.
And ecld.gamma_hgeo is the asymptotic expansion of \(\Gamma(s,x)\)
using hypergeometric series, \(e^{-x} x^{s-1} {}_2 F_0 (1,1-s;;-1/x)\).
It is mainly used in for star OGF \(L^{*}(k;\lambda)\).
ecld.gamma_2F0 is simply \({}_2 F_0 (1,1-s;;-1/x)\), which is used
in the star OGF expansion.
ecld.gamma(s, x = 0, na.stop = TRUE)ecld.gamma_hgeo(s, x, order)
ecld.gamma_2F0(s, x, order)
numeric vector, for the order of incomplete gamma function
numeric or MPFR vector
logical, stop if NaN is generated. The default is TRUE.
numeric, the order of the power series
numeric