AMPL Linux error: Cannot find "cplex"

[Andrea Bustillos]

Hello community,

I have a Java project in which I use AMPL to solve an optimization problem. Im the project I have a folder name lib with all the libraries and files that due to my experience, I need within my project to be independent of outside folders:

Building my project's path so the jar file is added into the path, this structure works great on a Windows enviroment. But when I do this in Linux, using the corresponding files for this , (the image is actually from my project in linux) I get the following error: "Cannot fin cplex". My java class looks like this:

 try {

            // Interpret the two files

            ampl.read("models/diet/diet.mod");

//            ampl.readData(modelDirectory + "/diet.dat");

            

            //read Run file that connects to oracle

            ampl.read("models/diet/diet-oracle_verified.run");

            // display objective function and diet constraits

            ampl.expand(ampl.getObjective("Total_Cost"));

            ampl.expand(ampl.getConstraint("Diet"));

            

            // select solver

//            ampl.setOption("solver", "cplexamp");

            ampl.eval("option solver cplex;");

            ampl.setOption("cplex_options", "baropt");

            

            // Solve

            ampl.solve();           

            //Write results in table

//            ampl.writeTable("dietFoods");

        } finally {

            ampl.close();

        }

As you can see, I've tried using cplex and cplexamp, eve ./cplex as I've seen suggested but nothing works. Also if I comment these lines AMPL doesn't find minos either, wich is I think the default solver.

Am I missing a file in my lib folder? How can I make this work?

Thanks in advance for any suggestions,

Andrea B.

[AMPL Google Group]

Hi Andrea,

Do you have the folder containing the AMPL binary in the system search path? On Linux this is usually done by adding the following line to the .bashrc file which should be at the root of your home directory.

export PATH="/full/path/to/the/folder/containing/the/ampl/binary:${PATH}"

Alternatively, with ampl.setOption("solver", "...") you can pass the complete path to the solver binary which should be in the same folder as the ampl binary.

Best regards,
Filipe

--
Filipe Brandão
am...@googlegroups.com

{#HS:564971083-5675#}

On Thu, Apr 19, 2018 at 9:03 PM UTC, Ampl Modeling Language <am...@googlegroups.com> wrote:

Hello community,

I have a Java project in which I use AMPL to solve an optimization problem. Im the project I have a folder name lib with all the libraries and files that due to my experience, I need within my project to be independent of outside folders:

Building my project's path so the jar file is added into the path, this structure works great on a Windows enviroment. But when I do this in Linux, using the corresponding files for this , (the image is actually from my project in linux) I get the following error: "Cannot fin cplex". My java class looks like this:

try {




// Interpret the two files

ampl.read("models/diet/diet.mod");

// ampl.readData(modelDirectory + "/diet.dat");

//read Run file that connects to oracle

ampl.read("models/diet/diet-oracle_verified.run");




// display objective function and diet constraits

ampl.expand(ampl.getObjective("Total_Cost"));

ampl.expand(ampl.getConstraint("Diet"));

// select solver

// ampl.setOption("solver", "cplexamp");

ampl.eval("option solver cplex;");

ampl.setOption("cplex_options", "baropt");

// Solve

ampl.solve();




//Write results in table

// ampl.writeTable("dietFoods");







} finally {

ampl.close();

}

As you can see, I've tried using cplex and cplexamp, eve ./cplex as I've seen suggested but nothing works. Also if I comment these lines AMPL doesn't find minos either, wich is I think the default solver.

Am I missing a file in my lib folder? How can I make this work?

Thanks in advance for any suggestions,

Andrea B.

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