[Numpy-discussion] Remove duplicate columns

[josef.pktd at gmail.com]

On Thu, May 6, 2010 at 4:45 PM, T J <tjhnson at gmail.com> wrote:
> On Thu, May 6, 2010 at 10:36 AM,  <josef.pktd at gmail.com> wrote:
>>
>> there is a thread last august on unique rows which might be useful,
>> and a thread in Dec 2008 for sorting rows
>>
>> something like
>>
>> np.unique1d(c.view([('',c.dtype)]*c.shape[1])).view(c.dtype).reshape(-1,c.shape[1])
>>
>> maybe it's np.unique with numpy 1.4.
>>
>
> The thread is useful:
>
>  http://www.mail-archive.com/numpy-discussion@scipy.org/msg19830.html
>
> I'll have to see if it is quicker for me to just do:
>
>>>> y = x.transpose().tolist()
>>>> y.sort()
>>>> x = np.array(y).transpose()

for sure it's easier to read. the difference might be temporary array
creation compared to using numpy.sort on a view.

Josef

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