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

David Goldsmith d_l_goldsmith@yahoo....
Tue Jul 7 01:21:22 CDT 2009


Also, there is a "non-method" way: the .T property:

>>> 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.T
>>> b
matrix([[1, 4, 7],
        [2, 5, 8],
        [3, 6, 9]])

DG

--- On Mon, 7/6/09, Chris Colbert <sccolbert@gmail.com> wrote:

> From: Chris Colbert <sccolbert@gmail.com>
> Subject: Re: [Numpy-discussion] transpose of a matrix should be another matrix
> To: "Discussion of Numerical Python" <numpy-discussion@scipy.org>
> Date: Monday, July 6, 2009, 10:42 PM
> 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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