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Re: normalized ALF (Assotiated Legendre Function)

From: Ben Abbott
Subject: Re: normalized ALF (Assotiated Legendre Function)
Date: Wed, 13 Feb 2008 07:40:58 -0800

On Wednesday, February 13, 2008, at 09:58AM, "Marco Caliari" <address@hidden> 
>I discovered that the warning is misleading. Consider
>The last entry is -Inf and the script "should" returns a warning (you 
>should replace scale == inf with abs(scale) == inf). But, there is no 
>instability: the value -Inf is "right", in the sense that it is too large 
>in magnitude to be represented. Now consider
>Again a warning (due to the check on a and b), but, again, no instability.
>Moreover, Matlab has no warnings and it is less robust. Consider
>in Matlab and with the script now enclosed. To conclude, I would suggest 
>to leave the warnings out.


I'll begin adding some tests and include on for "legendre(151,0) == Inf".

If you have any other good examples, feel free to post them!


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