[Numpy-discussion] how to list all the values in a ndarray without repeat (like filter in excel)

josef.pktd@gmai... josef.pktd@gmai...
Thu Oct 13 09:09:11 CDT 2011


On Thu, Oct 13, 2011 at 9:14 AM, Chao YUE <chaoyuejoy@gmail.com> wrote:
> Dear all,
>
> if I have a ndarray like array([1,2,3,2,3,1,1,1,2,2,....,2,2,3]) containing
> some values that are flag for data quality.
> how can list all the values in this array, like doing a descriptive
> statistics. I guess I should use Scipy statistics ?
> Thanks for any ideas.

Not sure what you are asking for

np.unique to get unique values
selecting by mask: mask = (myarr == 3), arr[mask]
or statistics of another variable by groups/flags: np.bincount(arr,
weights=myvar)

Josef


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> Chao
>
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