[Numpy-discussion] doc wiki edit rights (was: Inaccuracy in documentation of np.linalg.pinv)

Ralf Gommers ralf.gommers@googlemail....
Mon Mar 14 03:28:41 CDT 2011


On Sat, Mar 12, 2011 at 10:50 AM, Hao Xiong <hao@biostat.ucsf.edu> wrote:
> Hi Ralf,
>
> I am happy to edit it, although I will have to do it later as I won't
> have much free time recently.
>
> I have registered as haoxiong on docs.scipy.org and would like
> to request edit rights to the pinv page.

Hi, can someone with permissions on the doc server give Hao Xiong edit rights?

Thanks,
Ralf

>
> On 03/09/11 04:16, Ralf Gommers wrote:
>> Hi Hao,
>>
>> On Wed, Mar 9, 2011 at 9:01 AM, Hao Xiong <hao@biostat.ucsf.edu> wrote:
>>> I think the documentation for np.linalg.pinv contains some inaccuracies.
>> Thanks for your comments. Are you interested to make some improvements
>> yourself? It's quite easy to do on the numpy doc wiki:
>> http://docs.scipy.org/numpy/docs/numpy.linalg.linalg.pinv/
>> Just ask for edit rights on this list after registering a username.
>>
>> Cheers,
>> Ralf
>>
>>
>>> Most importantly, Moore-Penrose is not defined by the solution to the
>>> least-square
>>> problem. It was defined by the unique solution to 4 equations. Since SVD
>>> can be easily shown to satisfy the same 4 equations, it is the
>>> Moore-Penrose inverse.
>>>
>>> Another way that definition is wrong is that the least-square problem
>>> does not have to have
>>> unique solution. In fact, it can have infinitely many. In this case,
>>> Moore-Penrose is the minimum
>>> norm solution.
>>>
>>> All of this is discussed in the Matlab documentation of pinv, which is
>>> very good.
>>>
>>>
>>> Hao
>>> _______________________________________________
>>> NumPy-Discussion mailing list
>>> NumPy-Discussion@scipy.org
>>> http://mail.scipy.org/mailman/listinfo/numpy-discussion
>>>
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