[Clp] ClpSimplexNonlinear question
alex Dowson
alexdowson at hotmail.com
Mon Mar 25 01:06:04 EDT 2013
Hi All
I was talking about this paper that use PSLP for solving non-linear problem.
http://mansci.journal.informs.org/content/31/10/1312.abstract
alex
From: Jonathan Currie
Sent: Sunday, March 24, 2013 6:04 AM
To: 'alex Dowson' ; 'Ted Ralphs'
Cc: 'John Forrest' ; clp at list.coin-or.org
Subject: RE: [Clp] ClpSimplexNonlinear question
Hi Alex,
As the developer of OPTI I wrote most of the MEX interfaces, including the very basic CLP interface. I have never tried the CLP SLP solver, but if you have any questions regarding the interfacing of nonlinear solvers via MEX, then I am happy to help. I have been following this post and it sounds like it could be quite a bit of work to implement a general NLP interface (with a general nonlinear objective and nonlinear constraints called back to MATLAB) using CLP. John would be best to comment here, but typically interior point and sequential quadratic algorithms perform better for problems with largely nonlinear functions, than a sequential linear approach. Of course if your problem is only mildly nonlinear (bilinear or even quadratic), then the SLP approach may also work acceptably.
Jonathan
From: clp-bounces at list.coin-or.org [mailto:clp-bounces at list.coin-or.org] On Behalf Of alex Dowson
Sent: Saturday, 23 March 2013 6:13 p.m.
To: Ted Ralphs
Cc: clp at list.coin-or.org; John Forrest
Subject: Re: [Clp] ClpSimplexNonlinear question
Hi
Thank you for suggestion. I will get something out of this.
alex
From: Ted Ralphs
Sent: Saturday, March 23, 2013 4:28 AM
To: alex Dowson
Cc: John Forrest ; clp at list.coin-or.org
Subject: Re: [Clp] ClpSimplexNonlinear question
If you are trying to call COIN solvers from Matlab, you might save yourself some trouble looking at this:
http://www.i2c2.aut.ac.nz/Wiki/OPTI/index.php/Main/WhatIsOPTI?
I haven't used it, but it looks pretty complete and well-supported.
Cheers,
Ted
On Thu, Mar 21, 2013 at 12:49 AM, alex Dowson <alexdowson at hotmail.com> wrote:
Dear John
Thank you for code. I will try this.
Actually I wanted to make .mex file for matlab that I can call clp SLP solver from matlab so I have to understand how can pass
function and constraint from matlab without .mps file.
Also sorry about duplicate post I will follow rules.
Alex
-----Original Message----- From: John Forrest
Sent: Wednesday, March 20, 2013 8:16 PM
Cc: clp at list.coin-or.org
Subject: Re: [Clp] ClpSimplexNonlinear question
Alex,
I modified an example and attach it and solution log. I ran it as
testQP2 ../../../Data/Sample/share2qp.mps
that should show you how to load a model and a quadratic function. With
current code constraints are linear.
John Forrest
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