[Numpy-discussion] slicing with boolean in numpy master

Sebastian Berg sebastian@sipsolutions....
Wed Jun 26 11:01:06 CDT 2013


On Wed, 2013-06-26 at 11:30 -0400, josef.pktd@gmail.com wrote:
> Is there a change in the behavior of boolean slicing in current master?
> 

Yes, but I think this is probably a bug in statsmodel. I would expect
you should be using "..." and not ":" here, because ":" requires the
dimension to actually exist, and I *expect* that your mask actually has
the same dimensionality as the array itself.

I.e.:

x = np.arange(8).reshape(4,4)
mask = np.ones_like(x)
x[mask,:] # should NOT work, but this was buggy before current master.

- Sebastian

> If not I have to find another candidate in numpy master.
> 
> (py27d) E:\Josef\testing\tox\py27d\Scripts>python
> Python 2.7.1 (r271:86832, Nov 27 2010, 18:30:46) [MSC v.1500 32 bit
> (Intel)] on win32
> Type "help", "copyright", "credits" or "license" for more information.
> >>> import numpy as np
> >>> np.__version__
> '1.7.1'
> >>> x = np.ones((5,3))
> >>> mask = np.arange(5) < 4
> >>> x[mask, :]
> array([[ 1.,  1.,  1.],
>        [ 1.,  1.,  1.],
>        [ 1.,  1.,  1.],
>        [ 1.,  1.,  1.]])
> 
> 
> We get errors like the following when running the statsmodels tests
> with a current or recent numpy master, but not with numpy 1.7.1
> 
> ======================================================================
> ERROR: Failure: IndexError (too many indices)
> ----------------------------------------------------------------------
> Traceback (most recent call last):
>   File "/Users/tom/python2.7/lib/python2.7/site-packages/nose/loader.py",
> line 518, in makeTest
>     return self._makeTest(obj, parent)
>   File "/Users/tom/python2.7/lib/python2.7/site-packages/nose/loader.py",
> line 577, in _makeTest
>     return MethodTestCase(obj)
>   File "/Users/tom/python2.7/lib/python2.7/site-packages/nose/case.py",
> line 345, in __init__
>     self.inst = self.cls()
>   File "/Users/tom/python2.7/lib/python2.7/site-packages/statsmodels-0.5.0-py2.7-macosx-10.8-x86_64.egg/statsmodels/emplike/tests/test_aft.py",
> line 19, in __init__
>     super(Test_AFTModel, self).__init__()
>   File "/Users/tom/python2.7/lib/python2.7/site-packages/statsmodels-0.5.0-py2.7-macosx-10.8-x86_64.egg/statsmodels/emplike/tests/test_aft.py",
> line 12, in __init__
>     self.mod1 = sm.emplike.emplikeAFT(endog, exog, data.censors)
>   File "/Users/tom/python2.7/lib/python2.7/site-packages/statsmodels-0.5.0-py2.7-macosx-10.8-x86_64.egg/statsmodels/emplike/aft_el.py",
> line 248, in __init__
>     self.uncens_endog = self.endog[np.bool_(self.censors), :].\
> IndexError: too many indices
> 
> Thanks,
> 
> Josef
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