[Numpy-discussion] two dimensional array of sets
David Warde-Farley
dwf@cs.toronto....
Thu Aug 12 16:36:03 CDT 2010
On 2010-08-12, at 3:59 PM, gerardob wrote:
>
> Hello, this is a very basic question but i don't know the answer.
>
> I would like to construct a two dimensional array A, such that A[i][j]
> contains a set of numbers associated to the pair (i,j). For example, A[i][j]
> can be all the numbers that are written as i^n*j*5-n for some all n=1,..,5
>
> Is numpy what i need? if not which is the way to define such arrays. I mean,
> how do i declare an 2-dimensional array of a given size (for after start
> filling it with specific sets)?
The easiest way to do this would be
>>> import numpy as np
>>> n = 2
>>> i, j = np.ogrid[1:6, 1:6]
>>> arr = i**n * j*5 - n
>>> print arr
array([[ 3, 8, 13, 18, 23],
[ 18, 38, 58, 78, 98],
[ 43, 88, 133, 178, 223],
[ 78, 158, 238, 318, 398],
[123, 248, 373, 498, 623]])
David
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