[SciPy-user] umfpack installation (and dsolve error)
Mon Mar 23 12:44:04 CDT 2009
On Mon, 23 Mar 2009 17:38:27 +0000 (UTC)
Eric Friedman <email@example.com> wrote:
> Nils Wagner <nwagner <at> iam.uni-stuttgart.de> writes:
>> > btw, the reason for this is that I'm having a problem
>> >with dsolve which I think
>> > is a bug, but may just be my error.
>> > for example:
>> > a=matrix([[1,1],[1,1]])
>> > b= matrix([.5,.5]).T
>> > dsolve(a,b)
>> > yields [.5,.5]
>> > which is not a solution of ax=b - I think...
>> > (I also entered the matrix as sparse)
>> > any ideas what's going on here?
>> > thanks,
>> > Eric
>> Hi Eric,
>> Please not that your (dense) matrix is singular.
> sorry, I should have mentioned that I need to be able to
>solve singular matrices
> and will settle for any solution (since there will be
>many of them).
> (For nonsparse I've been using linalg.lstsq, which works
>fine for this.)
> any suggestions on which sparse solver to use?
Propack might be an option
AFAIK no python wrapper is available until now.
I have also filed a ticket
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