[Numpy-discussion] array manipulation
Warren Weckesser
warren.weckesser@enthought....
Tue Aug 17 10:08:49 CDT 2010
Alex Ter-Sarkissov wrote:
> hi, this is probably a very silly question, but I can't get my hear
> around it unfortunately(
>
> I have an array (say, mat=rand(3,5)) from which I 'pull out' a row
> (say, s1=mat[1,]). The problem is, the shape of this row s1 is not
> [1,5], as I would expect, but rather [5,], which means that I can't,
> for example, concateante mat and s1 rowwise.
>
You can use a trivial slice:
In [9]: a
Out[9]:
array([[ 0, 1, 2, 3, 4],
[ 5, 6, 7, 8, 9],
[10, 11, 12, 13, 14]])
In [10]: a[1] # This is a 1D array.
Out[10]: array([5, 6, 7, 8, 9])
In [11]: a[1:2] # This is a 2D array.
Out[11]: array([[5, 6, 7, 8, 9]])
Warren
>
>
> thanks for the help
>
>
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