[Numpy-discussion] extract elements of an array that are contained in another array?

Robert Cimrman cimrman3 at ntc.zcu.cz
Fri Jun 5 01:22:35 EDT 2009

josef.pktd at gmail.com wrote:
> On Thu, Jun 4, 2009 at 2:58 PM, Alan G Isaac <aisaac at american.edu> wrote:
>> On 6/4/2009 1:27 PM josef.pktd at gmail.com apparently wrote:
>>> Note: there are two versions of the docs for np.intersect1d, the
>>> currently published docs which describe the actual behavior (for the
>>> non-unique case), and the new docs on the doc editor
>>> http://docs.scipy.org/numpy/docs/numpy.lib.arraysetops.intersect1d/
>>> that describe the "intended" usage of the functions, which also
>>> corresponds closer to the original source docstring
>>> (http://docs.scipy.org/numpy/docs/numpy.lib.arraysetops.intersect1d/?revision=-227
>>> ). that's my interpretation
>> Again, the distributed docs do *not* describe the actual
>> behavior for the non-unique case.  E.g.,
>>>>> np.intersect1d([1,1,2,3,3,4], [1,4])
>> array([1, 1, 3, 4])
>> Might this is a better example of
>> failure than the one in the doc editor?
> Thanks, that's a very clear example of a wrong answer,
> and it removes the question whether the function makes any sense for
> the non-unique case.
> I changed the example in the doc editor to this one.
> It will hopefully merged with the source at the next update.

Thank you Josef!


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