# [Numpy-discussion] transpose of a matrix should be another matrix

Chris Colbert sccolbert@gmail....
Tue Jul 7 00:42:21 CDT 2009

```you actually have to call the method as transpose(). What you requested was
the actual method.

>>> import numpy as np
>>> a = np. matrix([[1,2,3],[4,5,6],[7,8,9]])
>>> a
matrix([[1, 2, 3],
[4, 5, 6],
[7, 8, 9]])
>>> b = a.transpose()
>>> b
matrix([[1, 4, 7],
[2, 5, 8],
[3, 6, 9]])
>>>

On Tue, Jul 7, 2009 at 1:34 AM, Dr. Phillip M. Feldman <pfeldman@verizon.net
> wrote:

>
> I'm using the Enthought Python Distribution. When I define a matrix and
> transpose it, it appears that the result is no longer a matrix (see below).
> This is both surprising and disappointing.  Any suggestions will be
> appreciated.
>
> In [16]: A=matrix([[1,2,3],[4,5,6],[7,8,9]])
>
> In [17]: B=A.transpose
>
> In [18]: A
> Out[18]:
> matrix([[1, 2, 3],
>        [4, 5, 6],
>        [7, 8, 9]])
>
> In [19]: B
> Out[19]: <built-in method transpose of matrix object at 0x00CF2A30>
> --
> View this message in context:
> http://www.nabble.com/transpose-of-a-matrix-should-be-another-matrix-tp24367402p24367402.html
> Sent from the Numpy-discussion mailing list archive at Nabble.com.
>
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