[Numpy-discussion] a.T

Charles R Harris charlesr.harris at gmail.com
Tue Dec 12 18:02:38 CST 2006


Hi all,

I'm curious about the error thrown when I use a.T as the left side of a
multiply assign. In the following, I am multiplying each the rows of 'a' by
the corresponding element of arange(n), i.e., broadcasting from the left.
The result looks fine, but an error is thrown after the operation is
complete.

In [62]: a = arange(12).reshape(3,2,2)

In [63]: a
Out[63]:
array([[[ 0,  1],
        [ 2,  3]],

       [[ 4,  5],
        [ 6,  7]],

       [[ 8,  9],
        [10, 11]]])

In [64]: a.T *= arange(3)
---------------------------------------------------------------------------
exceptions.TypeError                                 Traceback (most recent
call last)

/home/charris/workspace/microsat/tycho-work/<ipython console>

TypeError: attribute 'T' of 'numpy.ndarray' objects is not writable

In [65]: a
Out[65]:
array([[[ 0,  0],
        [ 0,  0]],

       [[ 4,  5],
        [ 6,  7]],

       [[16, 18],
        [20, 22]]])

Chuck
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