[Numpy-discussion] Find index of repeated numbers in array
Sturla Molden
sturla@molden...
Wed Dec 10 10:47:42 CST 2008
On 12/10/2008 5:38 PM, Ross Williamson wrote:
> Hi Everyone
>
> I think I'm missing something really obvious but what I would like to
> do is extract the indexes from an array where a number matches - For
> example
>
> data = [0,1,2,960,5,6,960,7]
>
> I would like to know, for example the indices which match 960 - i.e.
> it would return 3 and 6
>>> import numpy
>>> a = numpy.array([0,1,2,960,5,6,960,7])
>>> a == 960
array([False, False, False, True, False, False, True, False], dtype=bool)
>>> idx, = numpy.where(a == 960)
>>> idx
array([3, 6])
>>> idx.tolist()
[3, 6]
Sturla Molden
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