[Numpy-discussion] Upgrading from numpy 0.9.7.2416 to 0.9.9.2683

Keith Goodman kwgoodman at gmail.com
Tue Jun 27 13:44:06 CDT 2006


On 6/27/06, Travis Oliphant <oliphant.travis at ieee.org> wrote:

> Keith Goodman wrote:
> > This works in numpy 0.9.7.2416 but doesn't work in numpy 0.9.9.2683:
> >
> > Numpy 0.9.9.2683
> >
> > x = asmatrix(zeros((3,2), float))
> > y = asmatrix(rand(3,1))
> > y
> >
> > matrix([[ 0.49865026],
> >        [ 0.82675808],
> >        [ 0.30285247]])
> >
> > x[:,1] = y > 0.5
> > x
> >
> > matrix([[ 0.,  0.],
> >        [ 0.,  0.],  <--- this should be one (?)
> >        [ 0.,  0.]])
> >
> >
>
> This looks like a bug, probably introduced recently during the re-write
> of the copying and casting code.    Try checking out the revisions r2662
> and r2660 to see which one works for you.  I'll look into this problem.

Thanks for the tip. I get some extra output with r2660. It prints out
"Source array" and "Dest. array" like this:

>> x = asmatrix(zeros((3,2), float))

>> x

matrix([[ 0.,  0.],
       [ 0.,  0.],
       [ 0.,  0.]])

>> y = asmatrix(rand(3,1))

>> y

matrix([[ 0.60117193],
       [ 0.43883293],
       [ 0.01633154]])

>> x[:,1] = y > 0.5

Source array = (3 1)
Dest. array = (1 3)


>> x

matrix([[ 0.,  1.],
       [ 0.,  0.],
       [ 0.,  0.]])




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