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Search results: Decision Optimization CPLEX & For Watson Studio

Showing 99 of 106

OPL shall generate concert model with column API

OPL fails at building very large scale models due to the fact that it uses a "row api" of concert : Variables are created and added then to the range constraints. Unfortunately, such API can become dramatically slow for very large models, and bui...
almost 6 years ago in Decision Optimization CPLEX & For Watson Studio / CPLEX Optimization Studio 0 Not under consideration

Remove constand offset variable if it equals zero

Exporting an LP-file creates a fixed variable representing a constant offset. For many users, this is often zero, so it shuld be optional or not appearing if the offset is zero. cf. https://www.ibm.com/developerworks/community/forums/html/topic?id...
over 3 years ago in Decision Optimization CPLEX & For Watson Studio 0 Not under consideration

Dump Data into file with Setting

Being able to export the external data of a model to a .dat file with one click.I suggest an option in the .ops under language/Run.The best would be to right click on the .dat file (with the connection to file, DB or Excel) and have an export opti...
over 3 years ago in Decision Optimization CPLEX & For Watson Studio 0 Not under consideration

Implementation of iif indicator constraint in C API

We would like to be able to implement if-and-only-if indicator constraints in the C API.
over 3 years ago in Decision Optimization CPLEX & For Watson Studio 0 Planned for future release

Resolve race condition in CP optimizer engine

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...
over 3 years ago in Decision Optimization CPLEX & For Watson Studio 0 Not under consideration

Time to Best

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 ...
over 3 years ago in Decision Optimization CPLEX & For Watson Studio 0 Not under consideration

Implement piecewise linear features in Matlab API.

As for all the other APIs, it would be great to add to be able to describe PWLs with the new features introduced from 12.7.0, also in Matlab. The procedure to write several PWLs can become quite cumbersome for a large amount of constraints.
over 3 years ago in Decision Optimization CPLEX & For Watson Studio 0 Not under consideration

Document that mipgap and absmipgap are no pure termination criteria but can impact the path Cplex takes in B&C

As discussed in support case TS007960403, Cplex parameters mipgap and absmipgap can impact the path Cplex takes during Branch and Cut. I suggest to document this because from the description of the parameters one can expect that these are pure te...
over 2 years ago in Decision Optimization CPLEX & For Watson Studio 0 Future consideration

Interface between CPLEX and FORTRAN

Since FORTRAN is one of the TOP20 programming languages in the TIOBE index (https://www.tiobe.com/tiobe-index/), I suggest that IBM create mixed-integer linear programming models with CPLEX and FORTRAN. I have not found a library similar to Concer...
almost 3 years ago in Decision Optimization CPLEX & For Watson Studio / CPLEX Optimization Studio 0 Not under consideration

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