[Numpy-discussion] Fwd: np.unique for one bi-dimensional array

Giuseppe Amatulli giuseppe.amatulli@gmail....
Wed Jul 25 09:31:41 CDT 2012


Hi,

would like to identify unique pairs of numbers in two arrays o in one
bi-dimensional array, and count the observation

a_clean=array([4,4,5,4,4,4])
b_clean=array([3,5,4,4,3,4])

and obtain
(4,3,2)
(4,5,1)
(5,4,1)
(4,4,2)

I solved with tow loops but off course there will be a faster solution.

I was checking also

for np.unique but i did not find how to apply for a bi-dimensional array.
or
Concatenate the two arrays
a_concatenate=array([4_3,4_5,5_4,4_4,4_3,4_4]), then np.unique, then
split again.

Any other/faster solutions?
In bash I usually unique command
Thanks in advance
--
Giuseppe Amatulli
Web: www.spatial-ecology.net


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