you simply need to change the definition of ax: ax = slice(1,3) and all works fine. L.
On 1/30/08, Francesc Altet <[EMAIL PROTECTED]> wrote: > > A Wednesday 30 January 2008, Nadav Horesh escrigué: > > In the following piece of code: > > >>> import numpy as N > > >>> R = N.arange(9).reshape(3,3) > > >>> ax = [1,2] > > >>> R > > > > array([[0, 1, 2], > > [3, 4, 5], > > [6, 7, 8]]) > > > > >>> R[ax,:][:,ax] = 100 > > >>> R > > > > array([[0, 1, 2], > > [3, 4, 5], > > [6, 7, 8]]) > > > > Why R is not updated? > > Because R[ax] is not a view of R, but another copy of the original > object (fancy indexing does return references to different objects). > In order to get views, you must specify only a slice of the original > array. For example: > > In [50]: S = R[::2] > In [51]: S[:] = 2 > In [52]: R > Out[52]: > array([[2, 2, 2], > [3, 4, 5], > [2, 2, 2]]) > > So, what you need is something like: > > In [68]: R = N.arange(9).reshape(3,3) > In [69]: S = R[1:3,:][:,1:3] > In [70]: S[:] = 2 > In [71]: R > Out[71]: > array([[0, 1, 2], > [3, 2, 2], > [6, 2, 2]]) > > Cheers, > > -- > >0,0< Francesc Altet http://www.carabos.com/ > V V Cárabos Coop. V. Enjoy Data > "-" > _______________________________________________ > Numpy-discussion mailing list > Numpy-discussion@scipy.org > http://projects.scipy.org/mailman/listinfo/numpy-discussion > -- Lorenzo Bolla [EMAIL PROTECTED] http://lorenzobolla.emurse.com/
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