[Numpy-discussion] buggy buggy bugyy: format and casting ==> BUG in numpy.sum?
oliphant.travis at ieee.org
Mon Sep 18 13:52:24 CDT 2006
Eric Emsellem wrote:
> Hi again
> after some hours of debugging I finally (I think) found the problem:
> array([2, 4, 6])
> array([3, 9])
> Isn't the first line supposed to act as with "axis=0" by default (see
> help numpy.sum!)...???
> Not setting axis=0 it sums everything!
See the Release Notes page on www.scipy.org. It documents everything
that has changed. Several things will break old code as indicated.
There are several options for keeping old code working:
1) Use the numpy.oldnumeric compatibility layer which keeps the same
definitions and defaults as Numeric
2) Use conversion tools (like the recently added fix_default_axis) tool
to automatically insert axis=0 arguments in all code where it is not
present (or to automatically change the import to oldnumeric).
For the future, you must specify which axis you mean for a Nd array or
the code will assume you meant to work over the entire N-d array.
We all recognize this is a pain to change. That's why the backward
compatibilty options are avaiable and the tools have been written.
Believe me, I know what a pain it is. I have had to keep SciPy and
Matplotlib working with all the changes to NumPy.
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