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List:       gnuplot-info
Subject:    Re: [Gnuplot-info] All  points y value undefined...
From:       Hans-Bernhard_Bröker <HBBroeker () t-online ! de>
Date:       2009-02-11 19:36:25
Message-ID: 499328B9.8060906 () t-online ! de
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Julien Derr wrote:
> Hi everyone,
> I am trying to plot the gamma function, and have this error message....
> 
> gnuplot> plot 0.6*gamma(101)*gamma(100.6-x)/ 
> (gamma(100+0.6+1)*gamma(100-x+1))
>                                                                               ^
>           all points y value undefined!
> 

What was the x range?  What version of gnuplot ("show version long" 
output would be nice) is this?

> I can't believe this is not defined ! 

It very well might be.  Let me show you why:

gnuplot> print gamma(101)
9.33262154439422e+157
gnuplot> print gamma(101)**2

gnuplot> print gamma(101)**2
                ^
          undefined value

gamma is a *rapidly* growing function, and your computer has a finite 
range of values it can represent.

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