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To maintain two (or more) similar models in one instead of in two (or more) separate .mod files, we need the possibility of using if conditions in pre-processing in .mod files without using execution blocks.
Is there an equivalent of Cplex.SolveFixed() for OPL Script ? I'm looking for dual costs of a MILP. So I'd like to 1) solve it to get the solution. 2) solve the corresponding LP with fixed integer variables 3) get dual costs I don't know in advanc...
Information callback procedure for Benders algorithm
For MIP problems using branch-and-bound the CPLEX API offers the info or MIP callback procedure which can be used to retrieve information during a MIP search. For the Benders algorithm these callback procedures do not work (CPLEX 12.7 throws an er...
We've run into what seems to be a race condition in the cp optimizer engine with multiple workers. The issue occurs when a worker finds the initial solution right around the time limit. In this case, the engine believes that it timed out, but it a...
cpoptimizer interactive should display any var and expressions
CP Optimizer interactive should mimic CPLEX optimizer interactive for these two points 1. In Cp Optimizer command line, enable to display the value of an IloNumVar (floating point variables) and IloNumExpr2. enable write solution in a file
I want to put your attention on the optimization concept called "time to best" (ttb), i.e. the time needed by an optimization procedure to find the best solution regardless of the total time needed by its complete execution. Anyone working in the ...
I think that it can be valuable to offer OPL as a DSL in .NET. This can be an easy (cheap) way to combine the best of OPL and of the Cplex .NET API in one language. This way OPL remain for the definition of the problem but the control flow will be...
We have code that has to run under 12.7.1 and older version. Unfortunately the API for warm-start has changed. We have either vectors.setStart(cplex); // 12.7.1 or vectors.setVectors(cplex); // 12.6 OPL misses a nice way to access the version numb...
"If and only if" for indicator-constraints in MATLAB API
We use the CPLEX for MATLAB API to solve a MILP. In our case the bottleneck of the API is the limited functionality of indicator constraints. Whereas in OPL and the Java API an "if and only if" statement is possible, this functionality is missing ...
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