[Numpy-discussion] Numpy 1.4 MaskedArray bug?

[Pierre GM]

On Jan 12, 2010, at 1:52 PM, Charles R Harris wrote:
> 
> 
> 
> On Tue, Jan 12, 2010 at 11:32 AM, Pauli Virtanen <pav at iki.fi> wrote:
> ti, 2010-01-12 kello 12:51 -0500, Pierre GM kirjoitti:
> [clip]
> > >>>> a = numpy.ma.MaskedArray([[1,2,3],[4,5,6]])
> > >>>> numpy.ma.sum(a, 1)
> > > Traceback (most recent call last):
> > >  File "<stdin>", line 1, in <module>
> > >  File
> > > "/usr/lib64/python2.5/site-packages/numpy-1.4.0-py2.5-linux-x86_64.egg/n
> > > umpy/ma/core.py", line 5682, in __call__
> > >    return method(*args, **params)
> > >  File
> > > "/usr/lib64/python2.5/site-packages/numpy-1.4.0-py2.5-linux-x86_64.egg/n
> > > umpy/ma/core.py", line 4357, in sum
> > >    newmask = _mask.all(axis=axis)
> > > ValueError: axis(=1) out of bounds
> >
> > Confirmed.
> > Before I take full blame for it, can you try the following on both 1.3 and 1.4 ?
> > >>> np.array(False).all().sum(1)
> 
> Oh crap, it's mostly my fault:
> 
> http://projects.scipy.org/numpy/ticket/1286
> http://projects.scipy.org/numpy/changeset/7697
> http://projects.scipy.org/numpy/browser/trunk/doc/release/1.4.0-notes.rst#deprecations
> 
> Pretty embarassing, as very simple things break, although the test suite
> miraculously passes...
> 
> > Back to your problem: I'll fix that ASAIC, but it'll be on the SVN. Meanwhile, you can:
> > * Use -1 instead of 1 for your axis.
> > * Force the definition of a mask when you define your array with masked_array(...,mask=False)
> 
> Sounds like we need a 1.4.1 out at some point not too far in the future,
> then.
> 
> 
> If so, then it should be sooner rather than later in order to sync with the releases of ubuntu and fedora. Both of the upcoming releases still use 1.3.0, but that could change...

I guess that the easiest would be for me to provide a workaround for the bug (Pauli's modifications make sense, I was relying on a *feature* that wasn't very robust).
I'll update both the trunk and the 1.4.x branch