JuliaMath / JuliaMath/SpecialFunctions.jl

What about `gamma_inc_inv`'s derivative ?

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enhancement
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Description

I am hitting the following issue :

````julia
ERROR: MethodError: no method matching __gamma_inc_inv(::ForwardDiff.Dual{...}, ::ForwardDiff.Dual{...}, ::Bool)
````

Is there somewhere an implementation for such a derivative ? I guess the routines for the inverse of the gamma incomplete function are based on numerical root finding, so it that even possible ?

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