larry-discuss team mailing list archive

[josef.pktd@xxxxxxxxx]

On Mon, Feb 8, 2010 at 10:18 AM, Keith Goodman <kwgoodman@xxxxxxxxx> wrote:
> On Mon, Feb 8, 2010 at 7:15 AM,  <josef.pktd@xxxxxxxxx> wrote:
>> On Mon, Feb 8, 2010 at 10:05 AM, Keith Goodman <kwgoodman@xxxxxxxxx> wrote:
>>> After a long thread on how to support label indexing in larry, here's
>>> where we ended up:
>>>
>>> 1. Remove the indexing of labels by strings from the trunk.
>>>
>>> 2. Create a method larry.lix that can be used for label indexing like this:
>>>
>>> lar.lix['a']
>>> lar.lix['a':]
>>> lar.lix[:, 'a']
>>> lar.lix['a', 'b', 'c':]
>>
>> I'm not sure what the last index means, if there are several labels
>> for the same axis, they would need to be in a list_like
>> lar.lix[['a', 'b', 'c'], :]   to distinguish different elements for
>> one axis from elements for several axis.
>
> Yep. Good catch. Typo.

just for clarification, you also want to support label slices?

lar.lix[['a', 'b', 'c'], '2009-01-01':]  or
lar.lix[['a', 'b', 'c'], date1 :date2]

I don't think there is any ambiguity in the interpretation

>>
>> Josef
>>
>>>
>>> Only labels and slices are allowed. Inside the function the labels
>>> will be converted to indices and then a call will be made to
>>> lar[converted_index].
>>>
>>> 3. Indexing with more than one list will do rectangular indexing, not
>>> fancy indexing.
>>>
>>> OK, that's it. I'll start. I'll need help with #3
>>>
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>>
>