Hello all,
I am doing my project on facility location problem. It
involves almost 20 constraints and 400 binary variables. We have ILOG Cplex
installed on our server. AMPL is not installed with it. I need a proper
modelling language for using ILOG Cplex. Can I link gmpl to
> Many thanks for all your assistance. I should be able to get Glpk and
> Concorde working. Regarding the interface between Cplex and Concorde,
> I am running Cplex 12.2 at the moment and was wondering if you have
> any advice on interfacing between these programs? Would this requ
GLPK reads and writes models in cplex format, in the source package is the
documentation.
2009/9/25 G Chandramouli
> Hello all,
> I am doing my project on facility location problem. It
> involves almost 20 constraints and 400 binary variables. We have ILOG
> Cpl
Hello Mouli,
please, take a look at COIN-OR Symphony and OSI. These should
allow you to read GMPL files with GLPK and solve the problem
with CPLEX. Unfortunately GMPL postprocessing is not yet
supported.
See:
https://projects.coin-or.org/Osi/ticket/70
https://projects.coin-or.org/Osi
https
> I have a hard mixed integer problem. Due to the size of the problem, I
> like to specify it using Mathprog. But I have CPlex to do the number
> crunching, leading to the following setup:
>
> 1) Use GLPK to output the problem into LP format
> 2) Use CPlex to solve th
> I currently have GLPK 4.9 installed and the following CPLEX file:
> maximize 1
> st
> - 2 x1 - 3 x2 <= -1
> 2 x1 + 3 x2 <= 1
> - 1 x1 - 1 x2 <= -4
> 1 x1 + 1 x2 <= 4
> bounds
> x1 free
> x2 free
> end
>
> Cplex can read it.
> glpsolve
Amir,
GLPK don't use CPLEX. GPLK is also a solver and API. You don't need
another solver for mathprog (i.e) glpsol.
For AMPL and CPLEX users.
CPLEX/AMPL: GLPK/GMPL(MathProg
AMPL:GMPL(MatProg)
ampl model.mod model.dat; : glpsol - m model.mod -d
On 06/03/06, Andrew Makhorin <[EMAIL PROTECTED]> wrote:
> > I currently have GLPK 4.9 installed and the following CPLEX file:
> > maximize 1
> > st
> > - 2 x1 - 3 x2 <= -1
> > 2 x1 + 3 x2 <= 1
> > - 1 x1 - 1 x2 <= -4
> > 1 x1 + 1 x2 <= 4
Can you please tell me how to input a random matrix of 400 *
> 400 in GMPL or can I write it from some excel file ?
> Regards
> Mouli
>
>
> On Fri, Sep 25, 2009 at 11:09 PM, Jose Monreal wrote:
>
>> GLPK reads and writes models in cplex format, in the source package is
> > You may use 'glpsol -o filename --tmlim 1' to produce a listing that
> > contains all rows and columns in the same order as glpsol expects them
> > to appear on reading the solution file. Then compare that listing and
> > the cplex output to find which
On Sun, Jul 8, 2012 at 8:19 PM, Andrew Makhorin wrote:
> From scratch. I used the reference manual for cplex 9.0 publicly
> available on their internet site (IIRC, it was in 2004 or 2005, before
> IBM acquired this package) as well as some materials available on a
> public cplex for
> Browsing the glpk sources, I found the following file: examples/cplex/cplex.h
>
> I am the author of lazylpsolverlibs [1], a project aiming at
> generating proxy libraries for commercial lp solvers. My goal is to
> provide opensource libraries to link to for open source prog
Hi Andrew and Xypron
Many thanks for all your assistance. I should be able to get Glpk and
Concorde working. Regarding the interface between Cplex and Concorde, I am
running Cplex 12.2 at the moment and was wondering if you have any advice on
interfacing between these programs? Would this require
I have a hard mixed integer problem. Due to the size of the problem, I
like to specify it using Mathprog. But I have CPlex to do the number
crunching, leading to the following setup:
1) Use GLPK to output the problem into LP format
2) Use CPlex to solve the problem
3) Use conversion script to
Hi all,
I currently have GLPK 4.9 installed and the following CPLEX file:
maximize 1
st
- 2 x1 - 3 x2 <= -1
2 x1 + 3 x2 <= 1
- 1 x1 - 1 x2 <= -4
1 x1 + 1 x2 <= 4
bounds
x1 free
x2 free
end
Cplex can read it.
glpsolve:
$ glpsol --cpxlp test.lp
lpx_read_cpxlp: reading problem data f
Hello Amir,You can also use glpk to create a lp file to be used in cplex:glpsol -m model.mod -d data.dat --check --wcpxlp model.lpand on the cplex interactive optimizer prompt:>read model.lp>optimize>...All the best.Marcos
Em 14/12/2010 04:49, glpk xypron < xypron.g...@gmx.de >
> You can use the lp file directly in cplex. Although I think it is -wlp,
> but maybe I'm using an outdated version.
The options '--wlp filename' and '--wcpxlp filename' are equivalent (the
latter is obsolete and kept for compatibility).
> > I want to com
Hello Amir,
Coin-Or offers software which will allow you to write a model in
the GMPL language and to solve it with CPLEX. Please, refer to
http://www.coin-or.org/projects/SYMPHONY.xml
and
http://www.coin-or.org/projects/Osi.xml
If these libraries are too much overhead for you, you could also
Liambas Christos wrote:
> Hello everyone,
>
> Sorry for disturbing you but is there an implementation for using cplex
> in glpk? I’ve already subscribe to the mailing list but no confirmation
> mail come!I hope it will.
>
> Many thanks
>
>
Could you clarify wha
On 9/1/11 3:27 AM, Andrew Makhorin wrote:
You may use 'glpsol -o filename --tmlim 1' to produce a listing that
contains all rows and columns in the same order as glpsol expects them
to appear on reading the solution file. Then compare that listing and
the cplex output to find wh
Forwarded Message
From: Simon Vocella
To: help-glpk@gnu.org
Subject: translate addTerm Cplex Ilog
Date: Thu, 12 Jan 2012 12:41:52 +0100
Hi all,
I have a linear program with ilog/cplex of my friend and i'm trying to
translate in gplk-java. In the objective function i have
". All columns
should be added to the mip instance before a call to glp_integer.
> Could you do something like this with CPLEX?
AFAIK, cplex also does not allow generating columns during the
mip solution process. But I can mistake, so it #39;d be better to ask this
qus
This file:
\* MtxLP *\
Maximize
OBJ: C + A + B + D
Subject To
_C1: - A - B = 0
_C2: - A + C - D = 0
Bounds
A <= 1
B <= 1
D <= 1
C <= 1
End
causes glpsolto bomb out with the message:
lpx_read_cpxlp: reading problem data from `MtxLP-pulp.lp'...
MtxLP-pulp.lp:9: symbol `B' i
After considering it overnight, I'm inclined to attribute the difference to
user error creating the CPLEX version and focus my efforts on validating the
GMPL version. I completely changed the problem notation, so even in a
consistent format they would be very different and would take a d
Hi,
I got this simple MIP model (Cplex format) from
Sample for solving MIP (mixed integer programming) problem with GLPK
https://gist.github.com/2450935
Maximize
obj: x1 + 2 x2 + 3 x3 + x4
Subject To
c1: - x1 + x2 + x3 + 10 x4 <= 20
c2: x1 - 3 x2 + x3 <= 30
c3: x2 - 3.5
is as follows:
MILES
a.. MILES Code
ZIP file
You will need a solver, e.g., CPLEX or GLPK, to solve the LP. The results
reported in the paper were obtained using CPLEX. Here we provide a solver based
on GLPK (for Win XP), which is a little slower than CPLEX for the datase
> FYI: You can try to post your instance to the neos server; see
> http://www.neos-server.org/neos/solvers/index.html .
>
I submitted the mps format and CPLEX format in Neos server
Results.
1. MPS format in Gurobi - Objective function is 0.
2. CPLEX format. It was solved quickly
is as follows:
MILES
a.. MILES Code
ZIP file
You will need a solver, e.g., CPLEX or GLPK, to solve the LP. The results
reported in the paper were obtained using CPLEX. Here we provide a solver based
on GLPK (for Win XP), which is a little slow
Forwarded Message
From: smor...@ibisc.univ-evry.fr
To: help-glpk@gnu.org
Subject: MathProg to Cplex problem
Date: Mon, 7 Apr 2014 11:24:10 +0200
Hi All,
I'm a new user of both Cplex and Glpsol, and i'm currently facing a
strange problem which you guys might know
reading problem data from `MtxLP-pulp.lp'...
> MtxLP-pulp.lp:9: symbol `B' in wrong position
> CPLEX LP file processing error
This is because 'B' in the first position is recognized as the first
letter of the 'Bounds' keyword.
A common rule is *not to begin* ide
ls checks
that and raises the fatal error "operation not allowed". All columns
should be added to the mip instance before a call to glp_integer.
> Could you do something like this with CPLEX?
AFAIK, cplex also does not allow generating columns during the
mip solution process. But I c
, most solvers are supporting LP file without problem, such as CBC,
> LP_solve, Cplex, AMPL, GAMS, and SCIP.
>
On using other packages you will encounter the same issue, because, as I
mentioned earlier, cplex lp format doesn't allow encoding lp/mip in a
general form. AFAIK, for example,
Hello again, Andrew. Hi All.
I need some opinions. Actually Gusek use the following associations with
common language actions:
- Compile = Check GMPL sintax (--check)
- Build = Generate Cplex LP from GMPL (--wcpxlp) - (build expanded
equations, like a CTRL+G on lingo)
- Go = Run GMPL Model
And
sky
>
> A file of this package describing what to do with
> glpkmex.dll , glpk.dll, glpk49.dll
> is as follows:
> MILES
>
>
> ----
>
> a.. MILES Code
>
>
> ZIP file
>
>
&g
intuitive
interface to GLPK.
See
http://www.xypron.de/projects/linopt/xref/de/xypron/linopt/examples/CutSimple.html
for an example.
Best regards
Xypron
> Forwarded Message
> Subject: translate addTerm Cplex Ilog
> Date: Thu, 12 Jan 2012 12:41:52 +0100
>
> Hi all,
>
♫
Thanks very much, Noli. I'll go through the information you kindly provided.
My main intention was to use the capabilities of the new versions of CPLEX.
Regards,
Amir
___
Help-glpk mailing list
Help-glpk@gnu.org
http://lists.gnu.org/mailman/lis
ite upper bound, see
> http://lpsolve.sourceforge.net/5.5/mps-format.htm
>
> Same is true for Gurobi and ILOG CPLEX, see
> http://www.gurobi.com/doc/40/refman/node580.html
> http://www.lix.polytechnique.fr/~liberti/teaching/xct/cplex/reffileformatscplex.pdf
Xypron, looks like you have the same m
Hi Andew,
Thanks Andrew.
Learn more tricks on dealing with mps and lp files now.
We have to put "--max" or probably "--min" as well in submitting /
passing these files in glpsol.
MPS and Cplex lp files work perfectly now.
Thanks.
Noli
On 3/13/16, An
> In general I don't recommend generating instance files like MPS or CPLEX
> LP directly. If you don't want to use a modeling language because of
> size or other issues, then look at the APIs that solvers have to
> directly input an instance. COIN-OR OSI (Open Solver Int
Hi,
I want to use the CPLEX API interface code supplied with the distribution to
link an existing application with GLPK. The notes supplied indicate that
the API roughly matches CPLEX 9.0.
Going through the list of unresolved external symbols, I have identified a
small number of routines that
> > In CPLEX, I'd set the
> > mipgap value appropriately. After reading through the GLPK manual,
> Do not change tol_obj. Set the relative mip gap, say, to 0.01 (that
> means 1%) to prematurely stop the search. In this case you obtain
> a suboptimal solution. Bes
I am debugging the code I plan to use to generate cplex-format input files. I
am comparing my generated files to my "gold standard" which is a MathProg
model. I provide the MathProg model to glpsol and write out a cplex
translation to compare against my directly-generated cplex file
I'm doing basis pursuit using glpsol w/ input in CPLEX LP format. This has
worked extremely well, but I decided to modify my problem formulation and have
gotten myself into trouble.
The new problem formulation is:
D[k] = sum(i in m)(A[i] + sum(j in n)( B[i][j]*S[j][k]))
where the A[i]
At 7:13pm -0400 Sat, 20 Oct 2012, Reginald Beardsley wrote:
I've successfully converted from CPLEX to GMPL but have discovered
that the answers are different. They're both excellent, but they're
not the same.
I *think* I'm solving the same problems, but the input to glp
> Thanks, and is it possible to have it output the solution found?
> I searched --help flag but found nothing.
To write the solution into a file for further browsing use the
option '-o filename'.
P.S. Another, more correct way to specify a dummy objective in
cplex lp format
obj,x]=onenormsvm(Ktrain,label_train,lambda,mu);
>>>
>>> I would be very obliged to obtain your help
>>>
>>> Michael Rudzsky
>>>
>>> A file of this package describing what to do with
>>> glpkmex.dll , glpk.dll, glpk49.dll
>>&
On Fri, 2013-10-25 at 15:41 +0200, Jonas Behr wrote:
> Hi,
>
> I would like to switch from CPLEX to glpk and encountered the following
> problem.
>
> The solution returned by glp_intopt satisfies all constraints, but when
> compared to the
> CPLEX solution it is
Hello,
Is there any way to call CPLEX within a mod file in GLPK? In AMPL, it is
possible to do this by providing the path before the solve command; for
example, the following will do this job:
option solver "C:\AMPL112\cplexamp";
I am wondering if similar approach can be used in GLP
Hello Andrew,
users of GLPK have had often had problems with the accuracy of big M
formulations.
In CPLEX big M formulations can be replaced by indicator constraints.
This is a constraint switched on and off by a binary.
http://yalma.fime.uanl.mx/cplex11-manual/Content/Optimization/Documentation
Noli,
when you use
> ###
> var x{n in NUMBER}, integer;
> #
all the variables will be integers.
> X2 and X3 needs to Float / Real, based on the results of the Original
> Cplex problem.
If some variables are integers and others ara real, than you have to use
###
Hello world:
I need information about papers of mathematical programming and
operation research where they use glpk, to argue in my master thesis
(relations between integer programming problems and its polyhedron)
the use of glpk and not only cplex.
In other words, for what is possible use glpk
> I'm just a little lost as to where to start looking or how to
> interpret what the problem is exactly. Any insight appreciated. I'm
> happy to provide more info if it would be helpful.
You could write your instance also in cplex format specifying the
option '--wc
ion when glp_ios_reason returns
GLP_IHEUR for the first time.
Best regards
Xypron
Original-Nachricht
> Datum: Sat, 05 Feb 2011 23:22:29 -0500
> Betreff: [Help-glpk] restarting GLPK via a CPLEX LP file from the command
> line
> Hello List,
>
> When invoked
> I'm a new user of both Cplex and Glpsol, and i'm currently facing a
> strange problem which you guys might know how to go through. I want to
> convert a MathProg file into cplex formulation so that i can solve it
> faster.
>
> I use the simple command : glpsol -m m
; > A <= 1
> > B <= 1
> > D <= 1
> > C <= 1
> > End
> >
> > causes glpsolto bomb out with the message:
> >
> > lpx_read_cpxlp: reading problem data from `MtxLP-pulp.lp'...
> > MtxLP-pulp.lp:9: symbol `B' in wrong pos
/software/fachuebergreifend/or/cplex_doku/refcallablelibrary/html/functions/CPXchgcoeflist.html
To change a coefficient in GLPK you first have to read the row,
column, or matrix and then replace it.
Best regards
Xypron
Chris Alford wrote:
>
> Hi,
>
> I want to use the CPLEX API in
o work?
I understand Xypron's advice regarding switching my database to MySql. I
could potentially do this in the future, but for now, I really need to
connect to Excel and Access!
2. I used to use CPLEX through generating the .lp or the .mps file
through GLPK, then solve that using CPLEX.
can
> I get it to work?
I don't use these tools, but have you looked here:
http://en.wikibooks.org/wiki/GLPK/ODBC
http://en.wikibooks.org/wiki/GLPK/Windows_IDEs#Microsoft_Excel_integration
[snip : migrating to MySql]
> 2. I used to use CPLEX through generating the .lp
> or t
to be an upper bound of 1.
>>
>> lpsolve assumes an infinite upper bound, see
>> http://lpsolve.sourceforge.net/5.5/mps-format.htm
>>
>> Same is true for Gurobi and ILOG CPLEX, see
>> http://www.gurobi.com/doc/40/refman/node580.html
>> http://www.lix.polytech
Hello List,
When invoked from the command line, I note that GLPK has options to shut
off the presolver (--nopresol, --nointopt). Given the constraints that
I must use a CPLEX LP file to give GLPK my optimization problem, and
that I must run GLPK via the glpsol binary, is there a way to
> Translated MPS (fixed and freemps) and CPLEX (LP) from MathProg Model
> have 0.000 Objective function whereas the MathProg has correct
> objective function ( 7.153413121e+07)
>
> What causes these problems, not getting the right results?
>
> The logs of the 2 models (Ma
> Generating cc...
>> So it does not get to the optimization
>> piece. Are you sure it failed? Could it have been still working? On that
>> point...> Another, much better way for such plain models is to use cplex lp
> format.From experience with larger models, if
Driver (*.xls)}
> dbq=TestOne.xls
>
> Any thoughts why this is not working, and how can I get it to work?
>
> I understand Xypron's advice regarding switching my database to MySql. I
> could potentially do this in the future, but for now, I really need to
> connect
J} B[i,j];
Best regards
Xypron
Original-Nachricht
> Datum: Wed, 3 Oct 2012 09:55:18 -0700 (PDT)
> Betreff: [Help-glpk] Specifying a constraint in CPLEX notation
> I'm doing basis pursuit using glpsol w/ input in CPLEX LP format. This has
> worked extremely well,
A very basic webinterface to the GLPK stand-alone
solver is available at http://server1.managementscience.nl/demo/lp.
You can enter a LP program in CPLEX format and feed it to the solver. The
interface returns the solver output in plain text.
Best regards,
Paul
Mars
A very basic
t's the best way
to say I don't need an objective function?
In cplex I do: 'maximize 0'
Now, the central issue has to do with strict inequalities. Are they
supported in glpk? I've seen on some posts (some of them years ago,
2002) that they are not but I've also read ab
e of a decision variable is greater than a given constant value,
> and wich is equal to the product of a cost constant and the
> difference of the constant and the decision variable.
> I use ILOG OPL Studio for developing the model and CPLEX for solving
> it.
Please note that glpk is much wea
Hi Serge,
> The .lp files is solved by glpsol and cplex qith exactly the same
> answer. But the .mps file, even though it is solved by glpsol with
> the same solution, is rejected by Cplex, by Cbc (Coin-or) and by
> Qsopt as INFEASIBLE. So if everybody (except glpk) says the
> I am debugging the code I plan to use to generate cplex-format
> input files. I am comparing my generated files to my "gold standard"
> which is a MathProg model. I provide the MathProg model to glpsol and
> write out a cplex translation to compare against my directly-
Forwarded Message
From: Wang, Paul T. R.
To: help-glpk@gnu.org
Cc: Niedringhaus, William P.
Subject: input file to glpk sample code in java
Date: Mon, 28 Nov 2011 15:38:30 +
Sir/lady,
I have an input file, myLPFile, in CPLEX LP format, I import
org.gnu.glpk.* to my
Dear Daniele,
You can use the lp file directly in cplex. Although I think it is -wlp,
but maybe I'm using an outdated version.
Best regards,
Mate
On 08/02/2012 11:06 AM, Daniele Micarelli wrote:
> Hi
> I want to compare the results obtained with GLPSOL with those obtained
>
On Sun, 2022-05-29 at 18:42 +0200, Harald Mumm wrote:
> Hi Andrew,
>
> thank you very much for your help, but I could solve my problem in
> the
> meantime alone.
>
> Instead of glp_simplex I use now glp_exact and all dual prices are
> the
> same as in CPLEX
>
>> You could write your instance also in cplex format specifying the
>> option '--wcpxlp outfile' along with '--wopb' and then check both
>> the files. AFAIK cplex lp format is very similar to opb format.
>>
> I did as you suggested and it was qui
<= x[1] <= 40;
s.t. x4: 2 <= x[4] <= 3;
maximize obj: x[1] + 2 * x[2] + 3 * x[3] + x[4];
#
X2 and X3 needs to Float / Real, based on the results of the Original
Cplex problem.
This is the answer of the CPLEX problem.
##
No. Column name Activity Lower b
Hello Larry,
> There is a new add-on for Excel called OpenSolver.
> http://www.opensolver.org
> I was wondering if it is possible to make a GLPK add-on
> for Excel similar to this one.
opensolver creates a cplex file, calls cbc.exe with the
cplex file and then parses the solution fil
Hullo List,
I've recently created an LP that file that both CPlex and Gurobi accept
and solve, but that GLPK does not (LP file attached). The issue is the
use of infinity ('inf') on the right-hand side of a constraint.
Judging from the grammar in the comments above 'p
Hello Kevin
>> P.S. The ironic thing is that the only place that I can find a thorough
>> grammar for the *CPLEX* LP format is within the GLPK project. Kudos to
>> GLPK for quality code backed by an actual grammar!
You can find the ILOG documentation at
http://publ
Dear Asma,
the CPLEX file format is not aware of sets and indices. The only way you
can indicate indices is by using concatenated variable names like a(1,2).
See glpk-4.47/doc/glpk.pdf, section CPLEX LP Format.
Best regards
Xypron
On 14.11.2011 17:38, esma mehiaoui wrote:
otherwise how
I've successfully converted from CPLEX to GMPL but have discovered that the
answers are different. They're both excellent, but they're not the same.
My problem is quite floating point sensitive, so I'm using --exact for both.
I *think* I'm solving the same problems, b
Hi Reniere,
> ###
> var x{n in NUMBER_OF_INTEGER}, integer;
> var y{n in NUMBER_OF_REAL};
> #
OK. You are talking about 2 variables now. It is different topic, 2
matrices involved.
We need to return to the original question, how to translate this
simple CPLEX MIP model i
On Thu, 2017-06-15 at 08:29 -0500, Shuo Xu wrote:
> Dear GLPK makers:
>
> Currently, I am using GLPK to read a cplex-LP file.
>
> But ,the lp name is not available while using:
> glp_read_lp(lp, NULL, "Level_1.lp");
> // get the name
> char Prob
> GLPK can transfer the GLPK modeling into other file format, such as CPLEX
> and MPS. This is a very nice feature, and it would be nicer if variable
> name match is given for the transfer, i.e., a name match file listing the
> variable names in the GLPK model and the names in other
LPK sometimes calculates wrong dual prices?
> >
> > I send you an example in the attachment, where CPLEX calculates
> >
> > other dual prices than GLPK.
>
> Please note that LP may have multiple optimal solutions (in degenerate
> cases). This means that some co
; objective (which is now missing).
> So, more concretely:
> glpsol --math -m a.mod -d a.dat --wcpxlp a.cplex
> /* and subsequently */
> glpsol --cpxlp a.cplex
> provides different solutions.
> Something just doesn't seem right about that. Am I still missing
> somet
Hello Kevin,
if the right hand side is infinity the constraint is not really needed.
Which version of GLPK have you been using? GLPK 4.45 should support inf
and infinity.
Best regards
Xypron
Kevin Hunter wrote:
Hullo List,
I've recently created an LP that file that both CPlex and G
+0400
[snip]
> Files produced by the '--wlp filename' option are in
> cplex lp format and must work with the original cplex
> package.
Please see:
http://en.wikibooks.org/wiki/GLPK/Interoperability
http://en.wikibooks.org/w
I am presently working on converting a large AMPL/CPLEX model so I can
learn how the model works and also to compare the execution times with
CPLEX. I have managed to fix most of the obvious problems but I have a
couple of issues that I need to ask for help from the GLPK experts.
The first one is
?
In case of CPLEX one can use the so-called indicators:
http://www.ilog.com/products/cplex/news/whatsnew.cfm
I find the proposal in page 14 interesting:
J. N. Hooker, A principled approach to mixed integer/linear problem
formulation, June, revised August, to appear in ICS Proceedings 2009
On Sat, 2020-09-26 at 13:54 +0200, Domingo Alvarez Duarte wrote:
> Hello !
>
> Testing GLPK I left it solving examples/lie_goe.mod for more than 2
> hours and it didn't found a solution (wasm and native) then I stopped
> then and tried with cplex/gurobi/xpress/scip
> The only reason , I am reading the manual is I am writing a code in C++
> which should solve an MIP problem,Then if I understood you correctly, I
> can not use the way described in manual I have to save my data in order
> to feed GLPK in AMPL or cplex lp format, right?
I mean that i
solutions are now correct and the same as optimal solutions given by CPLEX and
Gurbobi.
Best regards
Marc
On 01.10.10 11:13, "Yingjie Lan" wrote:
> I have solved a MIP with 3 different solvers. Each solver
> gives an optimal solution after a few seconds.
> I w
Hi,
Browsing the glpk sources, I found the following file: examples/cplex/cplex.h
I am the author of lazylpsolverlibs [1], a project aiming at
generating proxy libraries for commercial lp solvers. My goal is to
provide opensource libraries to link to for open source programs that
use commercial
Hello all
The StackOverflow site has the following question:
http://stackoverflow.com/questions/502102/best-open-source-mixed-integer-optimization-solver
http://stackoverflow.com/questions/502102
Best open source mixed integer optimization solver
"I am using CPLEX for solving
Hi Andrew, Noli
To: Noli Sicad
Subject: Re: [Help-glpk] MIP Solvers (i.e CBC, CPLEX, GLPK, GUROBI, ..
Message-ID: <1353314481.1952.3.camel@corvax>
From: Andrew Makhorin
Date: Mon, 19 Nov 2012 12
;
> To verify and evaluate my solutions, I wanted to solve them using
> other commercial solvers. I used Gusec to translate my mod files (no
> external dat file) into lp and mps files. I ran each of my lp files on
> CPLEX and each of my mps files on Gurobi. Gurobi and CPLEX solutions
>
the final result, but no prior
iterations.
- The Interior Point solver lpx_interior(lp) gives exactly the same output
as when LPX_K_MSGLEV is set to 3 (full output).
b) I wrote the following code which reads data from a CPLEX LP file and
should not display anything on the screen.
lp
constant and the decision variable.
>
> > I use ILOG OPL Studio for developing the model and CPLEX for solving
> > it.
>
> Please note that glpk is much weaker than cplex in the sense of
> ability to solve large or hard MIPs.
>
> > Recently I got the hint to look for
Thanks again for the response.
> You could write your instance also in cplex format specifying the
> option '--wcpxlp outfile' along with '--wopb' and then check both
> the files. AFAIK cplex lp format is very similar to opb format.
>
I did as you suggested and
a.mod -d a.dat --wcpxlp a.cplex
/* and subsequently */
glpsol --cpxlp a.cplex
provides different solutions.
Something just doesn't seem right about that. Am I still missing something
fundamental here?
I looked at the cplex file as you suggested and I see at the end of the
objective funct
Hi, All!
I'm starting to research some bindings between MILP and CP (Constraint
Programming, also know as CLP - Constraint Logic Programming). Here at
UTFPR are some people here working on CPLEX with CLPEX CP
<http://www-01.ibm.com/software/commerce/optimization/cplex-cp-optimizer/>,
b
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