[Numpy-discussion] numpy.ma bug: need sanity check in masked_where

Eric Firing efiring@hawaii....
Mon Mar 17 15:34:41 CDT 2008


Charles R Harris wrote:
> File a ticket.

#703

Eric

> 
> On Mon, Mar 17, 2008 at 12:26 PM, Eric Firing <efiring@hawaii.edu 
> <mailto:efiring@hawaii.edu>> wrote:
> 
>     Pierre,
> 
>     I just tripped over what boils down to the sequence given below.  It
>     would be useful if the error in line 53 were trapped right away; as it
>     is, it results in a masked array that looks reasonable but fails in a
>     non-obvious way.
> 
>     Eric
> 
>     In [52]:x = [1,2]
> 
>     In [53]:y = ma.masked_where(False, x)
> 
>     In [54]:y
>     Out[54]:
>     masked_array(data = [1 2],
>           mask = False,
>           fill_value=999999)
> 
> 
>     In [55]:y[1]
>     ---------------------------------------------------------------------------
>     IndexError                                Traceback (most recent
>     call last)
> 
>     /home/efiring/<ipython console> in <module>()
> 
>     /usr/local/lib/python2.5/site-packages/numpy/ma/core.pyc in
>     __getitem__(self, indx)
>        1307         if not getattr(dout,'ndim', False):
>        1308             # Just a scalar............
>     -> 1309             if m is not nomask and m[indx]:
>        1310                 return masked
>        1311         else:
> 
>     IndexError: 0-d arrays can't be indexed
> 
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> 
> 
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