[Numpy-discussion] Re: How do I use numpy to do this? (original) (raw)
Sasha ndarray at mac.com
Thu Jun 1 12:27:02 EDT 2006
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mgrid[0:10, 5:15].reshape(2,100).transpose() array([[ 0, 5], [ 0, 6], [ 0, 7], [ 0, 8], ...])
On 6/1/06, Robert Kern <robert.kern at gmail.com> wrote:
Christopher Barker wrote: > > I'm trying to get the (x,y) coords for all the points in a grid, bound > by xmin, xmax, ymin, ymax. > > This list comprehension does it fine: > > Points = [(x,y) for x in xrange(minx, maxx) for y in xrange(miny, maxy)] > > But I can't think at the moment how to do it with numpy. Any ideas?
In [4]: x, y = mgrid[0:10, 5:15] In [5]: x Out[5]: array([[0, 0, 0, 0, 0, 0, 0, 0, 0, 0], [1, 1, 1, 1, 1, 1, 1, 1, 1, 1], [2, 2, 2, 2, 2, 2, 2, 2, 2, 2], [3, 3, 3, 3, 3, 3, 3, 3, 3, 3], [4, 4, 4, 4, 4, 4, 4, 4, 4, 4], [5, 5, 5, 5, 5, 5, 5, 5, 5, 5], [6, 6, 6, 6, 6, 6, 6, 6, 6, 6], [7, 7, 7, 7, 7, 7, 7, 7, 7, 7], [8, 8, 8, 8, 8, 8, 8, 8, 8, 8], [9, 9, 9, 9, 9, 9, 9, 9, 9, 9]]) In [6]: y Out[6]: array([[ 5, 6, 7, 8, 9, 10, 11, 12, 13, 14], [ 5, 6, 7, 8, 9, 10, 11, 12, 13, 14], [ 5, 6, 7, 8, 9, 10, 11, 12, 13, 14], [ 5, 6, 7, 8, 9, 10, 11, 12, 13, 14], [ 5, 6, 7, 8, 9, 10, 11, 12, 13, 14], [ 5, 6, 7, 8, 9, 10, 11, 12, 13, 14], [ 5, 6, 7, 8, 9, 10, 11, 12, 13, 14], [ 5, 6, 7, 8, 9, 10, 11, 12, 13, 14], [ 5, 6, 7, 8, 9, 10, 11, 12, 13, 14], [ 5, 6, 7, 8, 9, 10, 11, 12, 13, 14]]) In [8]: points = columnstack((x.ravel(), y.ravel())) In [9]: points Out[9]: array([[ 0, 5], [ 0, 6], [ 0, 7], [ 0, 8], [ 0, 9], [ 0, 10], ... -- Robert Kern "I have come to believe that the whole world is an enigma, a harmless enigma that is made terrible by our own mad attempt to interpret it as though it had an underlying truth." -- Umberto Eco
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