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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>
wrote:
>I discovered that the warning is misleading. Consider
>
>legendre(151,0)
>
>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
>
>legendre(151,eps)
>
>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
>
>legendre(151,-0.9)
>
>in Matlab and with the script now enclosed. To conclude, I would suggest
>to leave the warnings out.
>
>Marco
>
ok.
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!
Ben
- Re: normalized ALF (Assotiated Legendre Function), (continued)
- Re: normalized ALF (Assotiated Legendre Function), Marco Caliari, 2008/02/12
- Re: normalized ALF (Assotiated Legendre Function), Marco Caliari, 2008/02/12
- Re: normalized ALF (Assotiated Legendre Function), Ben Abbott, 2008/02/12
- Re: normalized ALF (Assotiated Legendre Function), Ben Abbott, 2008/02/12
- Re: normalized ALF (Assotiated Legendre Function), Ben Abbott, 2008/02/12
- Re: normalized ALF (Assotiated Legendre Function), Marco Caliari, 2008/02/13
- Re: normalized ALF (Assotiated Legendre Function), Ben Abbott, 2008/02/13
- Re: normalized ALF (Assotiated Legendre Function), Marco Caliari, 2008/02/13
- Re: normalized ALF (Assotiated Legendre Function), Ben Abbott, 2008/02/13
- Re: normalized ALF (Assotiated Legendre Function), Marco Caliari, 2008/02/13
- Re: normalized ALF (Assotiated Legendre Function),
Ben Abbott <=
- Re: normalized ALF (Assotiated Legendre Function), Ben Abbott, 2008/02/13
- Re: normalized ALF (Assotiated Legendre Function), Marco Caliari, 2008/02/14
- Re: normalized ALF (Assotiated Legendre Function), Ben Abbott, 2008/02/14
- Re: normalized ALF (Assotiated Legendre Function), Marco Caliari, 2008/02/12
- Re: normalized ALF (Assotiated Legendre Function), Ben Abbott, 2008/02/12