[Csdp] Csdp Digest, Vol 32, Issue 3
Dehghanpoor, Golnoosh
g.dehghanpoor at wustl.edu
Tue Jul 21 18:30:20 EDT 2015
Thanks for the note. The primal side is infeasible with a very small ratio.
Regards,
Golnoosh.
________________________________
From: csdp-bounces at list.coin-or.org <csdp-bounces at list.coin-or.org> on behalf of Imre Pólik <imre.polik at gmail.com>
Sent: Tuesday, July 21, 2015 12:06 PM
To: csdp at list.coin-or.org
Subject: Re: [Csdp] Csdp Digest, Vol 32, Issue 3
You may want to post the error measures from the sedumi solve. You can get them by setting pars.errors=1.
Imre
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Today's Topics:
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<mailto:g.dehghanpoor at wustl.edu>>
To: "csdp at list.coin-or.org<mailto:csdp at list.coin-or.org>" <csdp at list.coin-or.org<mailto:csdp at list.coin-or.org>>
Subject: [Csdp] comparison of CSDP and SeDumi
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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<mailto:borchers at nmt.edu>>
To: "Dehghanpoor, Golnoosh" <g.dehghanpoor at wustl.edu<mailto:g.dehghanpoor at wustl.edu>>
Cc: "csdp at list.coin-or.org<mailto:csdp at list.coin-or.org>" <csdp at list.coin-or.org<mailto:csdp at list.coin-or.org>>
Subject: Re: [Csdp] comparison of CSDP and SeDumi
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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<mailto: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<mailto:Csdp at list.coin-or.org>
> http://list.coin-or.org/mailman/listinfo/csdp
>
>
--
Brian Borchers borchers at nmt.edu<mailto:borchers at nmt.edu>
Department of Mathematics http://www.nmt.edu/~borchers/
New Mexico Tech Phone: (575) 322-2592<tel:%28575%29%20322-2592>
Socorro, NM 87801 FAX: (575) 835-5366<tel:%28575%29%20835-5366>
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