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Re: Landau distribution


Brian Gough wrote:
> 
> If the approximation is the only game in town then it's better to use
> that rather than not have a useful function.  The limitations should
> just be noted in the documentation.

I don't think I agree with that. Ideally there should be
some parameter which controls the accuracy. Then users can
decide for themselves what tradeoff to make.


> For special functions an error estimate is part of the computed answer
> so the function can accommodate a region where the approximation is
> less good.

Up to a point. People still expect some uniformity
of behaviour. You don't want the thing to just drop out,
especially if it is going to drop below standard
single-precision accuracy. People are probably not
expecting that when they are writing application
code, so mistakes could be made.

Anyway, I would be curious to see the range of choices
in the literature for this Landau thing. I assume Schorr's
method is not the only game in town. Can somebody tell
me where to look for this stuff?


Thanks.

-- 
G. Jungman


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