[Numpy-discussion] flat indexing of object arrays
Travis Oliphant
oliphant at ee.byu.edu
Thu Oct 5 18:42:01 EDT 2006
Matthew Brett wrote:
>Hi,
>
>On 10/5/06, Martin Wiechert <martin.wiechert at gmx.de> wrote:
>
>
>>Hi list,
>>
>>when I try to assign a sequence as an element of an object array via flat
>>indexing only the first element of the sequence is assigned:
>>
>>
>
>I've also been having trouble with flat on object arrays.
>
>Is this intended?
>
>In [1]: from numpy import *
>
>In [2]: a = arange(2)
>
>In [3]: a[1]
>Out[3]: 1
>
>In [4]: a.flat[1]
>Out[4]: 1
>
>In [5]: b = array([a], dtype=object)
>
>In [6]: b[1]
>---------------------------------------------------------------------------
>exceptions.IndexError Traceback (most
>recent call last)
>
>/home/mb312/devel_trees/scipy/Lib/io/<ipython console>
>
>IndexError: index out of bounds
>
>In [7]: b.flat[1]
>Out[7]: 1
>
>
>
This is correct behavior. Look at the shape of b. It is being indexed
correctly.
The problem is that it is ambiguous as to what is wanted when you write
b = array([a], dtype=object).
We have gone through the rounds on this one and the current behavior is
our best compromise.
-Travis
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