[Csdp] Csdp Digest, Vol 32, Issue 3

[Imre Pólik]

You may want to post the error measures from the sedumi solve. You can get
them by setting pars.errors=1.
Imre

On Tue, Jul 21, 2015 at 12:00 PM, <csdp-request at list.coin-or.org> wrote:

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> Today's Topics:
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>    1. comparison of CSDP and SeDumi (Dehghanpoor, Golnoosh)
>    2. Re: comparison of CSDP and SeDumi (Brian Borchers)
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> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 20 Jul 2015 20:26:28 +0000
> From: "Dehghanpoor, Golnoosh" <g.dehghanpoor at wustl.edu>
> To: "csdp at list.coin-or.org" <csdp at list.coin-or.org>
> Subject: [Csdp] comparison of CSDP and SeDumi
> Message-ID:
>         <
> BN3PR0201MB09610D9339DBA7DE87FE65FBEB850 at BN3PR0201MB0961.namprd02.prod.outlook.com
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> Content-Type: text/plain; charset="iso-8859-1"
>
> Hi,
>
>
> I'm trying to solve a SDP problem with CSDP (from gloptipoly package) ,
> which I've previously run with SeDumi and have gotten answer. But CSDP
> finds the same problem infeasible. Do you know what might be causing the
> problem? (I had to change [0 nsdpblocks+1 i i -c(i)] to full([0
> nsdpblocks+1 i i -c(i)]) in fprintf in writedspa function to get the code
> working). Thanks for your time.
>
>
> Regards,
>
> Golnoosh
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> ------------------------------
>
> Message: 2
> Date: Mon, 20 Jul 2015 18:50:18 -0600
> From: Brian Borchers <borchers at nmt.edu>
> To: "Dehghanpoor, Golnoosh" <g.dehghanpoor at wustl.edu>
> Cc: "csdp at list.coin-or.org" <csdp at list.coin-or.org>
> Subject: Re: [Csdp] comparison of CSDP and SeDumi
> Message-ID:
>         <CAE-H=HSPw6Hd2QpZi9WMfyuk91=
> C2SZc5tv_JDwrdjJVT6wMyQ at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Without seeing the problem, I can't give any sort of complete answer to
> this question.
>
> One common issue is that  SeDuMi has different requirements for feasibility
> than the other primal-dual interior point codes in that it will allow
> either the X or Z variable to have slightly negative eigenvalues, while
> CSDP, SDPT3, and SDPA all require that these variables have Cholesky
> factorizations.  There are many badly posed problems that are right on the
> edge of feasibility with respect to this issue.
>
>
> On Mon, Jul 20, 2015 at 2:26 PM, Dehghanpoor, Golnoosh <
> g.dehghanpoor at wustl.edu> wrote:
>
> >  Hi,
> >
> >
> >  I'm trying to solve a SDP problem with CSDP (from gloptipoly package) ,
> > which I've previously run with SeDumi and have gotten answer. But CSDP
> > finds the same problem infeasible. Do you know what might be causing the
> > problem? (I had to change [0 nsdpblocks+1 i i -c(i)] to full([0
> > nsdpblocks+1 i i -c(i)]) in fprintf in writedspa function to get the code
> > working). Thanks for your time.
> >
> >
> >  Regards,
> > Golnoosh
> >
> > _______________________________________________
> > Csdp mailing list
> > Csdp at list.coin-or.org
> > http://list.coin-or.org/mailman/listinfo/csdp
> >
> >
>
>
> --
> 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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> End of Csdp Digest, Vol 32, Issue 3
> ***********************************
>



-- 
http://imre.polik.net
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