[Cmpl] Error connecting to CPLEX

Oscar Augusto Téllez Sánchez oskarts at gmail.com
Thu Jan 1 05:10:40 EST 2015 

Hi I am trying to solve a problem with Cplex..but i got this error

Error (interfaces): can not connect the solver: Cplex ->/Applications/IBM/ILOG/CPLEX_Studio125/cplex/bin/x86-64_darwin/cplex

It seems, he can’t find the solver. Actually it is installed on myDisk/Users/oscar/Applications/IBM…

How can i change the address when invoking the solver through cmpl?

or do i have to reinstall in the given address?

thank you in advance and happy new year!

Oscar



> On 23 Nov 2014, at 19:06, Indrajit Sen Gupta <indrajitsg at gmail.com> wrote:
> 
> I did. It is still the same. I get "cplex failed - exit code" message. Is there any way to check why cplex failed?
>  
> 
> On Sun, Nov 23, 2014 at 11:29 PM, Mike Steglich <mike.steglich at berlin.de <mailto:mike.steglich at berlin.de>> wrote:
> Please move cplex1260.dll into Cmpl/Frameworks. Then it should work. This issues depend on the search path. The folder Cmpl\bin\Cplex is not in the search path and the DLL cannot be found.
> 
> 
> 
> Am 23.11.2014 um 18:49 schrieb Indrajit Sen Gupta <indrajitsg at gmail.com <mailto:indrajitsg at gmail.com>>:
> 
>> Hi Mike,
>>  
>> This example is from your manual:
>>  
>> --------------------------------------------------------------
>> %arg -solver cbc
>> parameters:
>>  c[] := (1,2,3);
>>  b[] := (15,20);
>>  A[,] := ((5.6, 7.7, 10.5),
>>    (9.8, 4.2, 11.1));
>>  
>> variables:
>>  x[defset(c[])] : real[0..];
>>  
>> objectives:
>>  c[]T * x[] -> max;
>> constraints:
>>  A[,] * x[] <= b[];
>>  
>> --------------------------------------------------------------
>>  
>> Regards,
>> Indrajit
>>  
>> 
>> On Sun, Nov 23, 2014 at 10:40 PM, Mike Steglich <mike.steglich at th-wildau.de <mailto:mike.steglich at th-wildau.de>> wrote:
>> Hi Indrajit,
>> 
>> Could try to solve it with Cbc and could you also send your model so that I can check it?
>> 
>> Cheers,
>> 
>> Mike
>> 
>> 
>> 
>> Am 23.11.2014 um 18:06 schrieb Indrajit Sen Gupta <indrajitsg at gmail.com <mailto:indrajitsg at gmail.com>>:
>> 
>>> Hi Mike,
>>>  
>>> I did as you said. Here is what I did after installing Cmpl in C:\Program Files (x86)\.
>>>  
>>> 1. Copied the CPLEX folder containing cplex.exe and cplex1260.dll inside \Cmpl\bin\
>>> 2. In cmpl.opt, I put: CplexFileName = CPLEX/cplex.exe
>>>  
>>> I no longer get "can not connect the solver message". What I get is:
>>>  
>>> ----------------------------------------------------------------------------------------
>>> Cmpl: cmpl prob04.cmpl
>>> CMPL model generation - running
>>> CMPL version: 1.10.0
>>> Authors: Thomas Schleiff, Mike Steglich
>>> Distributed under the GPLv3
>>> create model instance ...
>>> write model instance ...
>>> CMPL model generation - finished
>>> Solver - running
>>> Error (interfaces):  cplex failed - exit code ☺
>>> ----------------------------------------------------------------------------------------
>>>  
>>> Regards,
>>> Indrajit
>>>  
>>> 
>>> On Sun, Nov 23, 2014 at 3:43 PM, Mike Steglich <mike.steglich at berlin.de <mailto:mike.steglich at berlin.de>> wrote:
>>> Hi Indrajit,
>>> 
>>> Please install Cmpl in c:\program files\Cmpl (for win32) or in c:\program files (x86)\Cmpl (under win64) and use the .bat files (coliop.bat, cmplShell.bat, cmpl.bat) in the root of the Cmpl installation folder. I would like to suggest to use either Coliop for having a simple UI or CmplShell.bat to use Cmpl on the command line. All of these simple scripts set the environment for Cmpl. The intention was to prevent that a Cmpl user has to set a couple of environment variables on his/her own and not to change the original windows setting.
>>> 
>>> If you use the Cmpl binary or the Coliop jar file directly then it fails as we have seen for your problems to invoke Cplex an Scip. 
>>> 
>>> Please take a look at the installation hints at coliop.org/download.html <http://coliop.org/download.html> or in the manual.
>>> 
>>> Thanks,
>>> 
>>> Mike
>>> 
>>> 
>>> 
>>> Am 23.11.2014 um 03:23 schrieb Indrajit Sen Gupta <indrajitsg at gmail.com <mailto:indrajitsg at gmail.com>>:
>>> 
>>>> Hi Mike,
>>>>  
>>>> Here is something that I noticed when executing a CMPL problem with the default options. The first 27 lines of output that comes out:
>>>>  
>>>> ---------------------------------------------------------------------------------------------------
>>>> Cmpl: cmpl prob04.cmpl
>>>> CMPL model generation - running
>>>> CMPL version: 1.10.0
>>>> Authors: Thomas Schleiff, Mike Steglich
>>>> Distributed under the GPLv3
>>>> create model instance ...
>>>> write model instance ...
>>>> CMPL model generation - finished
>>>> Solver - running
>>>> Welcome to the CBC MILP Solver
>>>> Version: 2.8.8
>>>> Build Date: Dec 21 2013
>>>> Revision Number: 1998
>>>> command line - C:\Program Files (x86)\Cmpl\bin\..\Thirdparty\CBC\cbc prob04.mps max solve gsolu prob04.gsol (default strategy 1)
>>>> At line 2 NAME          prob04.cmpl
>>>> At line 3 ROWS
>>>> At line 7 COLUMNS
>>>> At line 16 RHS
>>>> At line 18 RANGES
>>>> At line 19 BOUNDS
>>>> At line 23 ENDATA
>>>> Problem prob04.cmpl has 2 rows, 3 columns and 6 elements
>>>> ---------------------------------------------------------------------------------------------------
>>>>  
>>>> Notice the line 19 which starts of with: command line - C:\Program File (x86) ....
>>>>  
>>>> Here is my question. I did not install CMPL in Program Files, instead in D:\DPF\CMPL. So why should the command line start with C:\... Any thoughts.
>>>>  
>>>> Regards,
>>>> Indrajit
>>>>  
>>>> 
>>>> On Sun, Nov 23, 2014 at 12:07 AM, Indrajit Sen Gupta <indrajitsg at gmail.com <mailto:indrajitsg at gmail.com>> wrote:
>>>> Hi Mike,
>>>>  
>>>> You are right. I will stick with CBC. All this started when I tried to connect to CPLEX. SCIP was just another optimizer that I downloaded to figure out why this problem is happening.
>>>>  
>>>> Thanks for your help anyway.
>>>>  
>>>> Regards,
>>>> Indrajit
>>>>  
>>>> 
>>>> On Sun, Nov 23, 2014 at 12:00 AM, Mike Steglich <mike.steglich at berlin.de <mailto:mike.steglich at berlin.de>> wrote:
>>>> Hi Indraji,
>>>> 
>>>> I'm not sure why scip is not working with Cmpl on your system with a setting that seems fine.  It sounds a bit like Murphy's Law. The hardcore workarround  is to copy all scip files into Cmpl/bin and remove the path in the scip entry in cmpl.opt.
>>>> 
>>>> Why don't you use Cbc? The performance is similar to Scip.
>>>> 
>>>> Cheers,
>>>> 
>>>> Mike
>>>> 
>>>> 
>>>> 
>>>> 
>>>> Am 22.11.2014 um 19:07 schrieb Indrajit Sen Gupta <indrajitsg at gmail.com <mailto:indrajitsg at gmail.com>>:
>>>> 
>>>>> Hi Mike,
>>>>>  
>>>>> SCIP works out of the box. I am using command line for all purposes. But here is the funny thing. I exported the problem from CMPL to MPS format and ran it through SCIP and got a sub optimal solution!!! I am not familiar with SCIP - just read the mps file and entered optimize. Its actually a small text book problem and the results shouldn't be different.
>>>>>  
>>>>> Regards,
>>>>> Indrajit
>>>>>  
>>>>> 
>>>>> On Sat, Nov 22, 2014 at 11:12 PM, Mike Steglich <mike.steglich at th-wildau.de <mailto:mike.steglich at th-wildau.de>> wrote:
>>>>> 
>>>>> 
>>>>>> Anfang der weitergeleiteten Nachricht:
>>>>>> 
>>>>>> Von: Mike Steglich <mike.steglich at th-wildau.de <mailto:mike.steglich at th-wildau.de>>
>>>>>> Betreff: Aw: [Cmpl] Error connecting to CPLEX
>>>>>> Datum: 22. November 2014 18:42:16 MEZ
>>>>>> An: Indrajit Sen Gupta <indrajitsg at gmail.com <mailto:indrajitsg at gmail.com>>
>>>>>> 
>>>>>> Hi Indrajit,
>>>>>> 
>>>>>> Framework is still in the (temporary) search path if you use Coliop.bat or cmplShell.bat. Does scip work out of the box w/o Cmpl?  
>>>>>> 
>>>>>> Cheers,
>>>>>> 
>>>>>> Mike
>>>>>> 
>>>>>> 
>>>>>>> Am 22.11.2014 um 18:36 schrieb Indrajit Sen Gupta <indrajitsg at gmail.com <mailto:indrajitsg at gmail.com>>:
>>>>>>> 
>>>>>>> Still no luck. :( Copied all the dlls and lib files to the Frameworks folder. I made sure that Frameworks is in search path. Am giving up for tonight.
>>>>>>>  
>>>>>>> Regards,
>>>>>>> Indrajit
>>>>>>>  
>>>>>>> 
>>>>>>> On Sat, Nov 22, 2014 at 10:45 PM, Mike Steglich <mike.steglich at th-wildau.de <mailto:mike.steglich at th-wildau.de>> wrote:
>>>>>>> The entry ScipFileName = ../Thirdparty/scip/scip-3.1.0.win.x86.msvc.opt.spx.ld.exe is fine.  
>>>>>>> 
>>>>>>> As mentioned before, please move the required libs (scip-3.1.0.win.x86.msvc.opt.spx.ld.dll and scip-3.1.0.win.x86.msvc.opt.spx.ld.lib)  into Cmpl/Frameworks …  
>>>>>>> 
>>>>>>>> Am 22.11.2014 um 18:08 schrieb Indrajit Sen Gupta <indrajitsg at gmail.com <mailto:indrajitsg at gmail.com>>:
>>>>>>>> 
>>>>>>>> These are the three files that I have in /Thirdparty/SCIP/
>>>>>>>>  
>>>>>>>> scip-3.1.0.win.x86.msvc.opt.spx.ld.dll
>>>>>>>> scip-3.1.0.win.x86.msvc.opt.spx.ld.exe
>>>>>>>> scip-3.1.0.win.x86.msvc.opt.spx.ld.lib
>>>>>>>>  
>>>>>>>> And this is the line in /bin/cmpl.opt
>>>>>>>>  
>>>>>>>> ScipFileName = ../Thirdparty/SCIP/scip-3.1.0.win.x86.msvc.opt.spx.ld.exe
>>>>>>>>  
>>>>>>>> Regards,
>>>>>>>> Indrajit
>>>>>>>>  
>>>>>>>>  
>>>>>>>> 
>>>>>>>> On Sat, Nov 22, 2014 at 10:20 PM, Mike Steglich <mike.steglich at th-wildau.de <mailto:mike.steglich at th-wildau.de>> wrote:
>>>>>>>> The following entries are working on my Windows test system:
>>>>>>>> 
>>>>>>>> CbcPath = ../Thirdparty/CBC/
>>>>>>>> GlpkPath =  ../Thirdparty/GLPK/
>>>>>>>> ScipFileName = ../Thirdparty/scip/scip.exe
>>>>>>>> CplexFileName = 
>>>>>>>> 
>>>>>>>> 
>>>>>>>> It works as expected when I include the CMPL header entry %arg -solver scip in my model.
>>>>>>>> 
>>>>>>>> Please copy the required DLLs into CMPL/Frameworks or in another folder that is in the search path.
>>>>>>>> 
>>>>>>>> This should work similar for Cplex.
>>>>>>>> 
>>>>>>>> Cheers,
>>>>>>>> 
>>>>>>>> Mike
>>>>>>>> 
>>>>>>>> 
>>>>>>>> 
>>>>>>>>> Am 22.11.2014 um 16:41 schrieb Indrajit Sen Gupta <indrajitsg at gmail.com <mailto:indrajitsg at gmail.com>>:
>>>>>>>>> 
>>>>>>>>> I tried all of the above and some more - but none worked.
>>>>>>>>>  
>>>>>>>>> I tried putting ../../ before the path to filename. So the full path would look like: ../../AMPL/ampl/cplex.exe
>>>>>>>>>  
>>>>>>>>> I even copied cplex.exe and cplex1260.dll into a folder under Thirdparty and tried running it with filename path as: ../Thirdparty/CPLEX/cplex.exe
>>>>>>>>>  
>>>>>>>>> Regards,
>>>>>>>>> Indrajit
>>>>>>>>>  
>>>>>>>>> 
>>>>>>>>> On Sat, Nov 22, 2014 at 3:02 PM, Mike Steglich <mike.steglich at th-wildau.de <mailto:mike.steglich at th-wildau.de>> wrote:
>>>>>>>>> Hi Indrajit,
>>>>>>>>> 
>>>>>>>>> It is unfortunately not possible to use drive letters to specify where Cplex is located.  Furthermore please use / instead of \. e.g. /DPF/Ampl/ampl/cplex.exe.
>>>>>>>>> 
>>>>>>>>> Cheers,
>>>>>>>>> 
>>>>>>>>> Mike
>>>>>>>>> 
>>>>>>>>> 
>>>>>>>>> 
>>>>>>>>> > Am 22.11.2014 um 09:29 schrieb Kamil Figiela <kfigiela at agh.edu.pl <mailto:kfigiela at agh.edu.pl>>:
>>>>>>>>> >
>>>>>>>>> > Probably it should say:
>>>>>>>>> >
>>>>>>>>> > CplexFileName = D:\DPF\AMPL\ampl\cplex.exe
>>>>>>>>> >
>>>>>>>>> > Best,
>>>>>>>>> > Kamil
>>>>>>>>> >
>>>>>>>>> >> Wiadomość napisana przez Indrajit Sen Gupta <indrajitsg at gmail.com <mailto:indrajitsg at gmail.com>> w dniu 22 lis 2014, o godz. 05:56:
>>>>>>>>> >>
>>>>>>>>> >> Hi Mike,
>>>>>>>>> >>
>>>>>>>>> >> I have a CPLEX demo version which came with AMPL demo version. I tried to use this solver with the option:
>>>>>>>>> >>
>>>>>>>>> >> %arg -solver cplex
>>>>>>>>> >>
>>>>>>>>> >> and with the following line in cmpl.opt file:
>>>>>>>>> >>
>>>>>>>>> >> CplexFileName = D:\DPF\AMPL\ampl\
>>>>>>>>> >>
>>>>>>>>> >> This is the path to the folder where cplex.exe is located. When I try to execute a model it says
>>>>>>>>> >>
>>>>>>>>> >> Error (interfaces): can not connect the solver: Cplex ->
>>>>>>>>> >>
>>>>>>>>> >> Any idea why this is happening?
>>>>>>>>> >>
>>>>>>>>> >> Regards,
>>>>>>>>> >> Indrajit
>>>>>>>>> >>
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>>>>>>>>> >
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