All Questions
12 questions
0
votes
1
answer
132
views
Exception from IBM ILOG concert: can not read data from excel
I am using IBM Cplex studio IDE to solve an optimization problem called location set covering problem with backup, I have coded the model and solved it for a small problem, which works fine. When I am ...
1
vote
1
answer
49
views
Proportionality in ILOG CPLEX
I am trying to include proportionality in my solution.
The .dat is as follows:
Farms = {Rice,Barns,Snyder};
Crops = {Corn,Wheat,SoyBeans};
UsableLand = [400,600,300];
Water = [600,800,375];
...
- 11
0
votes
1
answer
62
views
CPLEX ILOG - 3 Crops across 3 Farms
I am trying to solve 9 planting decisions for 3 crops on each of 3 farms.
I am given data for Available land on each farm, Available water on each farm, Maximum Quota for each crop, Water Consumption ...
- 11
0
votes
1
answer
406
views
CPLEX: How to run subset constraints in OPL?
CPLEX; Mixed Integer Linear Programming; Constraint Formulation:
There are 150 towns in the dataset, each town having several markets (or "mandis"). Total number of mandis in the dataset = ...
- 31
-1
votes
1
answer
429
views
ILOG CPLEX: Constraint assigning a decision variable in specific order
In CPLEX I built the attached model which I want to use for locating products to locations. The constraint that tries to order the allocation of products to locations in ascending order Stackingorder[...
- 1
0
votes
1
answer
319
views
Cplex Concert technology duals
I tried to get the duals of constraints
This is the code, implemented in C++:
IloEnv env;
IloModel MasterProblem(env);
IloNumVarArray XX(env,Create_routes.size(),0,IloInfinity,ILOFLOAT);...
- 55
0
votes
1
answer
3k
views
Sum and conditions in linear programming - Cplex // OPL
Is there an easy way to apply a condition into a sum in OPL or to get around this problem ?
For example is it possible to do something like :
forall (i in Factories)
forall( j in Time)
...
- 269
1
vote
1
answer
513
views
Generating random solutions in CPLEX
I have a simple model in IBM ILOG CPLEX.
dvar float x in 1..99;
dvar float y in 1..99;
dvar float z in 1..99;
subject to
{
x + y - z == 41.3;
}
I need random solutions for x, y and z. However, I ...
user1310377
1
vote
1
answer
1k
views
How to use IloExprArray in code?
I have just started to use cplex library and get stuck in defining IloExprArray in my code. Here is my snippet of code:
IloExprArray diff;
diff= IloExprArray(iloEnv,list.size());
for( int i=1; i<=...
- 11.1k
1
vote
1
answer
473
views
How to get only one path beginning and ending at same node?
I'm trying to run this model in Cplex/OPL to find the best path given distances of shops, and quantities + prices in each shop for different products.
The problem is I'm getting results of paths that ...
- 173
11
votes
1
answer
10k
views
How to make cplex not output to terminal
I am using the IBM cplex optimizer to solve an optimization problem and I don't want all terminal prints that the optimizer does. Is there a member that turns this off in the IloCplex or IloModel ...
- 3,776
5
votes
1
answer
1k
views
Optimal use of CPLEX Java for high-throughput
I am solving large optimization problems with CPLEX Java API. Currently I just
IloCplex cplex = new IloCplex();
... add lots of variables and constraints ...
cplex.solve();
cplex.end();
This works ...
- 5,540