[SciPy-user] Sparse factorisation

[Robert Cimrman]

Gael Varoquaux wrote:
> On Fri, May 01, 2009 at 12:40:32PM +0200, Gael Varoquaux wrote:
>> As you have mentioned on the track ticket, the build is failing, and
>> we'll fix this.
> 
> OK, that was purely on my side. I was being stupid: I did not have the
> proper headers installed.
> 
>> I'll cook up a patch to get things working on my system, with a proper
>> error message.
> 
> So, I'll make only an error message, something like:
> 
> 
> Something like:
> 
> """
> Scipy was built without umfpack support. For umfpack, you need to install
> umfpack and the developement headers before building scipy.
> """
> 
> We can add this on the import failure, scipy/sparse/linalg/dsolve/umfpack
> $ vim umfpack.py, line 13, in with case we need to delay this import. The
> other option is to add the error message in the init of UmfpackContext.
> It wouid thus give a meangingful error message if _um is None.
> 
> What do you think?

I suggest not printing anything unless the user wants to use it - so the 
UmfpackContext should take care of it, IMHO.

r.