Raymond Toy writes:
>>>>>>"Vadim" == Vadim V Zhytnikov writes:
>
>
> Vadim> I just want to remind that quite a bit ago you promised
> Vadim> to take a look at gamma-lanczos for gamma function at
> Vadim> complex argument. gamma-lanczos code is already hare
>
> Did I? My apologies for having forgotten!
>
No problems.
> What was the issue? That we don't evaluate gamma function for complex
> args? This is mostly like because no one added the appropriate
> knowledge to gamma to recognize complex numbers.
>
It would be great to have complex gamma in 5.9.2 - gamma-lanczos
is in the csimp2.lisp.
> Vadim> In general I still don't understand what is preferred way
> Vadim> to calculate complex valued expression involving
> Vadim> elementary or special functions numerically?
> Vadim> It seems that rectform is required for expression with
> Vadim> elementary functions. Is is so for special functions.
>
> Vadim> Which special functions can be evaluated numerically
> Vadim> by Maxima CVS? At real arguments? At complex arguments?
>
> As a initial answer, maxima doesn't know how to evaluate special
> functions at complex args. :-( But there are exceptions of course.
>
> Ray
>
--
Vadim V. Zhytnikov