Questions tagged [opl]

OPL is a modeling language for mathematical programming and combinatorial optimization problems. It is the first modeling language to combine high-level algebraic and set notations from modeling languages with a rich constraint language and the ability to specify search procedures and strategies that is the essence of constraint programming.

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CPLEX OPL - Problem of arrangements and increments

I have a problem involving work shifts and assembly stations. Work shifts have the subscript = T Workstations have the subscript = J My decision variable is X[t][j] For each turn (T) I am trying to ...
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1 answer
190 views

Tuples OPL in VRP

I am trying to build a constraint of the form x[i j] +x[j i] <y[i][j] where x is a decision variable if arc ...
3 votes
1 answer
291 views

CPLEX oplrun says the problem size has exceeded, but then proceeds to solve the problem anyway

I have downloaded and installed the CPLEX Studio Community Edition 20.1.0.0 on my Linux machine (KUbuntu). I want to use the oplrun tool directly from the terminal. ...
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1 vote
1 answer
180 views

Operator error in operating cost model constraint

I have built a model to minimize the operating cost and when I coded a model in CPLEX, it gave an error at Cons09: ...
3 votes
4 answers
371 views

Book recommendations on OPL

Are there any good books that teach how to work with OPL in CPLEX? I searched but I didn't find any.
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1 answer
384 views

Why some decision variables don't get values in Cplex?

I use this code in the cplex and don't know why some decision variables don't get value, I attach my code below. I don't know my model is wrong or my code? I haven't error in the code but have some ...
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1 vote
1 answer
679 views

How define variable in CPLEX and What is diffrence between decision variables and variable in CPLEX

I want to code a problem by CPLEX, in this problem I have variables and decision variables, how define them? In this picture you can see the variables: which we have: I use these codes for variables:...
  • 55
1 vote
1 answer
109 views

Coding the OR problem with cplex

I am new to using OPL. I wrote a CPLEX code for the vaccine distribution from a paper, it doesn't get an error, but it hasn't given the answer. I don't know its problem; please help me; I attached the ...
  • 55
1 vote
1 answer
103 views

Get array of sequences for array of interval arrays in OPL

So I want to define multiple sequences (an array of them). I have this: ...