All Questions
207 questions
0
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1
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33
views
How to add an Array to a datasource in Cplex with Java API using an OPL model?
I'm a newbie with cplex. I have a model which is written in opl and I want to run the model from my java application. To do that I want to fill the external data directly from my application instead ...
- 3
-1
votes
1
answer
50
views
How to Solve p-median with Java CPLEX?
This is an equivalent model to the sample that ships with CPLEX Studio/opl/examples/opl/pmedian, but written in OPL. Here is the equivalent in Java:
import ilog.concert.IloConstraint;
import ilog....
- 17
0
votes
2
answers
4k
views
java.lang.ClassNotFoundException: com.zerog.lax.LAX
I'm trying to install a software called CPLEX, from IBM. They provided me with an .bin installer. When I try to run it, I get an error when a class is not found. Since I'm not familiar with this ...
0
votes
1
answer
56
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Writing a simple CPLEX model
I'm trying to write a CPLEX model that reflects this set of constraints:
x, y, z in { 1, 2, 3 }
constraint C1: AllDiff(x,y,z)
constraint C2: z == x + 2y
constraint C3: y < x
constraint C4: z == 2x
...
0
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0
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56
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CPLEX Java StaticLex is not applicable for (iloNumexpr, iloNumexpr)
I need to blend two objective functions f1 and f2 (see image here) where c is a continuous variable, C_{ug} is a binary variable and a,d and f are parameters. I'm using Cplex Studio IDE 22.1.0 Java ...
- 1
-3
votes
1
answer
61
views
Exception in thread "main" java.lang.UnsupportedOperationException: CpxRange for general expressions error
i want to find solution of this problem plz:i use java,cplex .eclipse-java-2022-03-R-win32-x86_64 : the details are:
obj : min x1x4(x1+x2+x3)+x4
s.t :x1.x2.x3.x4>=25
(square x1)+(square x2)+(...
0
votes
1
answer
315
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Variables annotations in CPLEX for Automatic Benders decomposition Java API
I am trying to implement the automatic benders decomposition to my problem using CPLEX version 20.10. I want to use USER strategy where CPLEX attempts to decompose the model according to my ...
- 41
1
vote
1
answer
266
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Integrate CPLEX with a Java application
We are developing an application that will use CPLEX to solve an industrial problem. A mathematical model (mod file) has been developed. We would like to use this model directly instead of re-...
- 305
0
votes
1
answer
763
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java unable to find native libraries on java.library.path
So I am trying to run a very simple java program that uses IBM CPLEX on a mac. The program recognizes the JAR file but cannot seem to find the native implementations no matter where I point to it.
The ...
- 720
0
votes
0
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48
views
How to code a constaint that contains an integral in java &cplex?
I started Java programming 2 months ago. I don't know how to code a constraint in the Java+Cplex library. This constraint contains an integral. Does Java contain an integral library already and I'll ...
- 1
1
vote
0
answers
149
views
How to divide IloNumExpr from Cplex?
I'm using Java to solve a maximization problem in Cplex.
My objective function is quite complex. In a nutshell, there are two parts, A and B. Both of them contain variables.
My goal is to maximize A/B,...
- 11
0
votes
0
answers
72
views
Link error: How do I run CPLEX java example in macos?
Am I missing anyting e.g escape char, '/', that would cause this linkage error?
Command:
/Library/Java/JavaVirtualMachines/adoptopenjdk-8.jdk/Contents/Home/bin/java \
-Djava.library.path=/...
- 5,759
1
vote
0
answers
81
views
How to use CPLEX on google colab with java programming?
As IBM CPLEX can be accessed on the google colab by using python programming I was wondering if, is there any way to use that by java programming on the colab? If so, how we can import the CPLEX java ...
- 113
1
vote
2
answers
243
views
How to enable linear relaxation outputs
I have a rather complex MILP, but the main problem is the number of continuous variables, not the number of binaries. I just "hard-coded" the linear relaxation to understand its output, and ...
- 125
0
votes
1
answer
227
views
How to get values of vars by its name
I'm using the CPLEX Java interface to do some MIP problems, the optimizer is doing well but I can't get values of vars by their names.
The definitions of my vars are in a for loop, so in the outer ...
