[SciPy-user] RREF - upper triangular
nwagner at mecha.uni-stuttgart.de
Thu Feb 23 07:07:25 CST 2006
Arnd Baecker wrote:
>On Thu, 23 Feb 2006, Nils Wagner wrote:
>>arnd.baecker at web.de wrote:
>>>On Wed, 22 Feb 2006, Alan G Isaac wrote:
>>>>On Wed, 22 Feb 2006, Nils Wagner apparently wrote:
>>>>>here is a code. However it doesn't make use of LAPACK. So
>>>>>it might be to slow.
>>>>This exchange suggests to me that Robert thinks that
>>>>wrapping the LAPACK code is approximately trivial but that
>>>>Nils does not see it that way. Apologies for any
>>>But in this particular case previous exposure to wrapping lapack
>>>functions is granted:
>[... snipped my remarks on how to use f2py ...]
>>If it is so trivial to add the rank revealing QR decomposition to scipy,
>>I would be glad if the several steps on building a wrapper for DGEQP3
>>could be documented on the Wiki as an exercise.
>>The best way to learn something is to have a well-elaborated example. :-)
>Have you *studied* the material I wrote in the snipped part,
>*including* the texts I referred to?
>Also, maybe you remember, that the wrapper *you* posted
>and claimed to be *yours* was in fact written by *me* for *you*.
>We had an off-list exchange with over 20 mails on this
>in which I tried to guide you step-by-step
>through the Hessenberg wrapping. In course
>of that I also send you a detailed step-by-step example
>on how to wrap band matrices.
>So the exercise you propose (including the addition to the wiki)
>is really left to you.
>I am sure that this list will help you with any concrete questions.
>I better stop now, before I write things which I might regret later ...
>SciPy-user mailing list
>SciPy-user at scipy.net
It was not my intention to claim that I have build the wrapper. Sorry
for that matter.
Afaik Pearu finally integrated hessenberg into scipy.
More information about the SciPy-user