[Numpy-discussion] feedback request: proposal to add masks to the core ndarray

Charles R Harris charlesr.harris@gmail....
Thu Jun 23 18:33:44 CDT 2011


On Thu, Jun 23, 2011 at 5:14 PM, Mark Wiebe <mwwiebe@gmail.com> wrote:

> On Thu, Jun 23, 2011 at 6:02 PM, Charles R Harris <
> charlesr.harris@gmail.com> wrote:
>
>> On Thu, Jun 23, 2011 at 4:43 PM, Mark Wiebe <mwwiebe@gmail.com> wrote:
>>
>>> On Thu, Jun 23, 2011 at 5:24 PM, Pierre GM <pgmdevlist@gmail.com> wrote:
>>>
>>>>
>>>> On Jun 23, 2011, at 11:55 PM, Mark Wiebe wrote:
>>>>
>>>> > On Thu, Jun 23, 2011 at 4:46 PM, Charles R Harris <
>>>> charlesr.harris@gmail.com> wrote:
>>>> > On Thu, Jun 23, 2011 at 2:53 PM, Mark Wiebe <mwwiebe@gmail.com>
>>>> wrote:
>>>> > Enthought has asked me to look into the "missing data" problem and how
>>>> NumPy could treat it better. I've considered the different ideas of adding
>>>> dtype variants with a special signal value and masked arrays, and concluded
>>>> that adding masks to the core ndarray appears is the best way to deal with
>>>> the problem in general.
>>>> >
>>>> > I've written a NEP that proposes a particular design, viewable here:
>>>> >
>>>> >
>>>> https://github.com/m-paradox/numpy/blob/cmaskedarray/doc/neps/c-masked-array.rst
>>>>
>>>> Mmh, after timeseries, now masked arrays... Mark, I start to see a
>>>> pattern here ;)
>>>
>>>
>>>  I think it speaks to what's on Enthought's mind, in any case. :)
>>>
>>
>> What is the thinking at Enthought about this? I sense a meeting in the
>> background and it would be nice to know what the motivations were.
>>
>
> A lot of these things were discussed at the DataArray summit they held here
> a while ago, but the general push is towards being more approachable and
> friendly to people who use R or do statistical data analysis on possibly
> messy data. I don't use R, but I think I'm fairly good at producing things
> which are both powerful and intuitive in the end, which is what I'm trying
> to do here. That's my understanding of the thinking, others at Enthought
> will have to correct me if I'm wrong...
>
>
One thing that wasn't clear to me in the NEP was how one might experiment
with different masks on a fixed set of data.

Chuck
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