On Tue, 2004-12-07 at 23:02, Steven Bethard wrote:
> LutherRevisited wrote:
> > I'm wanting to do something with a list that is basically a 2 dimensional
> > array. I'm not so good with lists so can someone give me an example of how
> > I
> > might implement this in Python? thanks.
>
> If you're planning to do anything serious with a 2D array, you should
> probably look at numarray:
> http://www.stsci.edu/resources/software_hardware/numarray
>
> >>> import numarray as na
> >>> arr = na.array(range(10), shape=(5, 2))
> >>> arr
> array([[0, 1],
> [2, 3],
> [4, 5],
> [6, 7],
> [8, 9]])
> >>> arr[0,1]
> 1
> >>> arr[4,0]
> 8
>
> If you're not doing any heavy computation, you can probably do this with
> nested lists:
>
> >>> arr = [[0, 1],
> ... [2, 3],
> ... [4, 5],
> ... [6, 7],
> ... [8, 9]]
> >>> arr[0][1]
> 1
> >>> arr[4][0]
> 8
>
> Steve
If your data is sparse you might want to consider using a dictionary
where the key is a tuple representing the coordinates.
a = {}
a[(0,0)] = 0
a[(0,1)] = 1
a[(1,0)] = 2
a[(1,1)] = 3
a[(2,0)] = 4
a[(2,1)] = 5
a[(3,0)] = 6
a[(3,1)] = 7
a[(4,0)] = 8
a[(4,1)] = 9
>>> a.get( (3,0), None )
6
>>> print a.get( (5,0), None )
None
Adam DePrince
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