I think you just can't use newaxis in advanced indexing (doc says "The newaxis<http://docs.scipy.org/doc/numpy/reference/arrays.indexing.html#numpy.newaxis>object can be used in the basic slicing syntax", and does not mention newaxis in the advanced indexing part). -=- Olivier Le 1 février 2012 04:25, Mark Bakker <markbak@gmail.com> a écrit :

Hello list,

I am trying to specify the indices of an array with a list and add a newaxis, but that combination doesn't seem to be allowed. Any reason why? Here's an example:

a = arange(3)

This works:

a[[0,2]][:,newaxis] Out[445]: array([[0], [2]])

This is more elegant syntax (and, I thought, correct), but it doesn't work:

a[[0,2],newaxis] --------------------------------------------------------------------------- TypeError Traceback (most recent call last) /Users/mark/ttim/svn/trunk/<ipython-input-444-b37a4cca4311> in <module>() ----> 1 a[[0,2],newaxis]

TypeError: long() argument must be a string or a number, not 'NoneType'

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