[Numpy-discussion] use slicing as argument values?

Robert Kern robert.kern@gmail....
Thu Jul 12 15:49:16 CDT 2012


On Thu, Jul 12, 2012 at 9:46 PM, Chao YUE <chaoyuejoy@gmail.com> wrote:
> Hi Ben,
>
> it helps a lot. I am nearly finishing a function in a way I think pythonic.
> Just one more question, I have:
>
> In [24]: b=np.arange(1,11)
>
> In [25]: b
> Out[25]: array([ 1,  2,  3,  4,  5,  6,  7,  8,  9, 10])
>
> In [26]: b[slice(1)]
> Out[26]: array([1])
>
> In [27]: b[slice(4)]
> Out[27]: array([1, 2, 3, 4])
>
> In [28]: b[slice(None,4)]
> Out[28]: array([1, 2, 3, 4])
>
> so slice(4) is actually slice(None,4), how can I exactly want retrieve a[4]
> using slice object?

You don't. You use 4.

-- 
Robert Kern


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