# [Numpy-discussion] A bit of advice?

Neal Becker ndbecker2@gmail....
Thu Jun 23 07:20:32 CDT 2011

```Olivier Delalleau wrote:

> dict((k, [e for e in arr if (e['x0'], e['x1']) == k]) for k in cases)
> ?

BTW, is there an easier way to get the unique keys, then this:

cases = tuple (set (tuple((e['a'],e['b'])) for e in u))

>
> (note: it is inefficient written this way though)
>
> -=- Olivier
>
> 2011/6/23 Neal Becker <ndbecker2@gmail.com>
>
>> I have a set of experiments that I want to plot.  There will be many plots.
>> Each will show different test conditions.
>>
>> Suppose I put each of the test conditions and results into a recarray.  The
>> recarray could be:
>>
>> arr = np.empty ((#experiments,), dtype=[('x0',int), ('x1',int), ('y0',int)]
>>
>> where x0,x1 are 2 test conditions, and y0 is a result.
>>
>> First I want to group the plots such according to the test conditions.  So,
>> I
>> want to first find what all the combinations of test conditions are.
>>
>> Dunno if there is anything simpler than:
>>
>> cases = tuple (set ((e['x0'], e['x1'])) for e in arr)
>>
>> Next, need to select all those experiments which match each of these cases.
>>  Now
>> I know of no easy way.
>>
>> Any suggestions?  Perhaps I should look again at pytables?
>>
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>>

```