[Numpy-discussion] array indexing problem
Rahul Kanwar
rkanwar at geol.sc.edu
Tue Aug 29 18:57:45 CDT 2006
Hello,
I am trying to extract a column from a 2D array here is what is have
done:
--------------------------------------------
In [3]: a = array([[1,2,3],[1,2,3]])
In [4]: a
Out[4]:
array([[1, 2, 3],
[1, 2, 3]])
In [5]: a[:, 1]
Out[5]: array([2, 2])
In [6]: a[:, 1:2]
Out[6]:
array([[2],
[2]])
--------------------------------------------
when i use a[:, 1] i get a 1x2 array where as when i use a[:, 1:2] i get
a 2x1 array. The intuitive behavior of a[:, 1] should be a 2x1 array. Am
i doing something wrong here or is there some reason for this behavior ?
regards,
Rahul
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