[Numpy-discussion] problems with numdifftools

Pauli Virtanen pav@iki...
Tue Oct 26 14:28:59 CDT 2010


Tue, 26 Oct 2010 12:16:53 -0700, Nicolai Heitz wrote:
> I am not sure if you are the right persons to contact but if not I would
> appreciate a short notice and maybe an address where I can find help. I
> already posted this this message in an other python mailing list and
> they forwarded me to this list and told me that I might find help here.

Some comments:

1) General advice: When doing numerics, it's generally a good idea to use 
units natural for the problem, and not SI ones. The numbers the computer 
sees should be of order 1. Not all numerical algorithms are scale 
invariant.

2) The scipy-user list might be even more appropriate:

http://mail.scipy.org/mailman/listinfo/scipy-user

3) The numdifftools authors might be more knowledgeable about their 
software:

http://code.google.com/p/numdifftools/

If you are sure it's a bug in numdifftools, click the issues tab and 
write a report. Be sure to include simple test case (like the one you 
attached).

-- 
Pauli Virtanen



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