[Numpy-discussion] How do I use numpy to do this?

Rob Hooft rob at hooft.net
Fri Jun 2 00:31:27 CDT 2006


Christopher Barker wrote:
> x = N.arange(minx, maxx+Spacing, Spacing) # makeing sure to get the last 
> point
> y = N.arange(miny, maxy+Spacing, Spacing) # an extra is OK
> points = N.zeros((len(y), len(x), 2), N.Float)
> x.shape = (1,-1)
> y.shape = (-1,1)
> points[:,:,0] += x
> points[:,:,1] += y
> points.shape = (-1,2)
> 
> print points

How about something like:

 >>> k=Numeric.repeat(range(0,5+1),Numeric.ones(6)*7)
 >>> l=Numeric.resize(range(0,6+1),[42])
 >>> 
zone=Numeric.concatenate((k[:,Numeric.NewAxis],l[:,Numeric.NewAxis]),axis=1)
 >>> zone
array([[0, 0],
        [0, 1],
        [0, 2],
...
        [5, 4],
        [5, 5],
        [5, 6]])

This is the same speed as Robert Kern's solution for large arrays, a bit 
slower for small arrays. Both are a little faster than yours.

Rob
-- 
Rob W.W. Hooft  ||  rob at hooft.net  ||  http://www.hooft.net/people/rob/
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