[Csdp] Error "Function is not defined for sparse inputs." during writesdp.m

[Henri Kjellberg]

Thanks again Brian,

That fixed it!

I would like to educate myself on the topic of manipulating problems into
the SDPA format. Now I see the CSDP solver can operate quickly enough to
meet real-time spacecraft attitude control requirements. However,
formulating the problem from lmi statements using yalmip in MATLAB is
incredibly slow. I would like to learn how to do this analytically or
efficiently otherwise. Do you have any pointers to get me started on this
quest? I

Thank you again for all of your time. I will clean up my edits to get the
cblas and clapack functioning in the code and send them to you this weekend.

Kind regards,
Henri Kjellberg
National Defense Engineering Graduate Fellow
Satellite Design Laboratory
University of Texas at Austin


On Tue, Nov 9, 2010 at 8:13 PM, Brian Borchers <borchers at nmt.edu> wrote:

> On Tue, Nov 9, 2010 at 5:21 PM, Henri Kjellberg
> <henrikjellberg at gmail.com> wrote:
> > Hi Brian,
> > Here is the output from the debugger:
> > K>> fid
> > fid =
> >      4
> > K>> i
> > i =
> >      4
> > K>> c(i)
> > ans =
> >    (1,1)           -0.459883916200743
> >
>
> That's very interesting.  Somehow, mdl.C(4) is a sparse array of size
> 1 by 1 rather than a scalar on your system.  The vector mdl.C itself
> starts out sparse, but I can see absolutely no reason that mdl.C(4)
> should be a sparse matrix- it's a specific element of that vector.
>
> On my system (which is running MATLAB 2009A),  mdl.C(4) is a regular
> scalar rather than a sparse 1x1 matrix::
>
> >> mdl.C(4)
>
> ans =
>
>   -0.4599
>
>
>
> This appears to be a bug or at least a change in the semantics of
> MATLAB between R2009A and your 2010 version.  If I can find a system
> running MATLAB 2010 I'll investigate further.
>
> In the mean time, try the following workaround:
>
> mdl.C=full(mdl.C);
> mdl.b=full(mdl.b);
>
> before calling csdp().   This will waste some storage but should work
> around this issue.
>
> --
> Brian Borchers                          borchers at nmt.edu
> Department of Mathematics      http://www.nmt.edu/~borchers/
> New Mexico Tech                       Phone: (575) 322-2592
> Socorro, NM 87801                   FAX: (575) 835-5366
>
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