Decision Optimization

Decision Optimization

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Problem with Matlab API presolve

  • 1.  Problem with Matlab API presolve

    Posted Tue June 26, 2012 08:31 PM

    Originally posted by: Eumpfenbach


    I just want to turn off presolve. Matlab API. Cplex 12.2. I add this just before I call lp_sub.solve():

    lp_sub.Param.preprocessing.presolve.Cur = 0;
    lp_sub.Param.preprocessing.reduce.Cur = 0;

    But still I see rows and columns being removed:

    Tried aggregator 0 times.
    No LP presolve or aggregator reductions.
    Presolve time = 0.02 sec.
    Tried aggregator 1 time.
    LP Presolve eliminated 2830 rows and 109 columns.
    Aggregator did 2 substitutions.
    Reduced LP has 52486 rows, 34391 columns, and 240366 nonzeros.
    Presolve time = 0.14 sec.
    Parallel mode: using up to 4 threads for barrier.

    Do I have to do something special because I am using the Barrier algorithm?
    #CPLEXOptimizers
    #DecisionOptimization


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