[Numpy-discussion] matrix.std() returns array

Zachary Pincus zpincus at stanford.edu
Thu Apr 27 01:22:05 CDT 2006

On a slightly-related note, was anyone able to reproduce the  
exception with matrix types and the var() method?
e.g. numpy.matrix([[1,2,3], [1,2,3]]).var() complains about unaligned  

Presumably if std is fixed in SVN, so is var. Also if a std unit test  
is added, a var one should be too.


On Apr 27, 2006, at 12:51 AM, Travis Oliphant wrote:

> Keith Goodman wrote:
>> I noticed that the mean of a matrix is a matrix but the standard
>> deviation of a matrix is an array. Is that the expected behavior? I'm
>> also getting the wrong values (0 and nan) for the standard deviation.
>> Did I mess something up?
>> I'm trying to learn scipy (and python) by porting a small Octave
>> program. I installed numpy from svn (today) on a Debian box. And
>> numpy.test() says OK.
> This should be fixed now in SVN.  If somebody can add a test that  
> would be great.
> Note, that the methods taking axes also now preserve row and column  
> orientation for matrices.
> -Travis
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