On 2009-08-19 01:48 AM, Pierre wrote:
Hello,
I would like to know how to find the difference (set operation)
between 2 arrays :
a = array([1,2, 3,2,5,2])
b = array([1,2])
I want a - b = [3,5]
Well, the equivalence of setdiff in matlab...
You will want to ask numpy questions on the numpy mailing list.
http://www.scipy.org/Mailing_Lists
Using set() is frequently a good option, but for large arrays, you will want to
avoid the overhead of converting to and from sets and use numpy.setdiff1d(a, b):
In [2]: a = array([1,2, 3,2,5,2])
In [3]: b = array([1,2])
In [4]: numpy.setdiff1d(a, b)
Out[4]: array([3, 5])
--
Robert Kern
"I have come to believe that the whole world is an enigma, a harmless enigma
that is made terrible by our own mad attempt to interpret it as though it had
an underlying truth."
-- Umberto Eco
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