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digamma(::Complex{BigFloat}) #147

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improbable-22 opened this issue Mar 5, 2019 · 1 comment
Closed

digamma(::Complex{BigFloat}) #147

improbable-22 opened this issue Mar 5, 2019 · 1 comment

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@improbable-22
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Is there by any chance a trick for evaluating digamma(::Complex{BigFloat})?

It looks like digamma(::BigFloat) calls something from MPFR, which does not appear to have a complex version (https://www.mpfr.org/mpfr-current/mpfr.html#Special-Functions) so it would have to be some other way...
@improbable-22
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Maybe I can answer this: after some googling I found the "Arb" library, which is wrapped by https://github.com/JeffreySarnoff/ArbNumerics.jl . This provides high-precision versions of many special functions, including digamma.

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