Originally posted by: lyxthe

Hello,

I use cplex via the plug in optimJ which auto-generates java model for cplex from an easy pseudocode to write MILP. The problem I have is that in that way, I have no informations about what Cplex does. I don't know how much cols and rows and non-zeros have my problem. I don't know if this lack of infos comes from optimj or the program I've maid, anyway I tried to explicitly give a file for writing logs, by using setOut(Outstream), but the logfile that was made is empty.

I would like to have these infos because the problem is quite complex and I don't know how I may parameter cplex if I don't know what it looks like (what simplex algo use, what presolve or scaling ask ...)

Here is my question. Is there another way to have those intells about how is the matrix generated ? Do you know it juste by looking at your problem ? What does normally look like the log file? Have you an idea to retrive these informations ?

Thanks for your answers.

Lyxthe

Originally posted by: Laci Ladanyi

This question really sould be asked on an optimJ forum (optimJ's home page says support is available on this google group: https://groups.google.com/forum/#!forum/optimj-users). Also, in the optimJ manual there is an "Accessing the solver API" section which might be helpful.

--Laci