Decision Optimization

Decision Optimization

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Help! How can i put logarithms into an optimization goal,with error"Concert exception caught: IloAlgorithm cannot extract extractables"

  • 1.  Help! How can i put logarithms into an optimization goal,with error"Concert exception caught: IloAlgorithm cannot extract extractables"

    Posted 08/25/20 02:42 AM

    now,I want to solve a problem,

    IloNumVarArray r(env); IloNumExpr sum2(env, 0); for(){ sum2 += r[i] * IloLog(r[i]);} model.add(IloMinimize(env, sum2));

    but ,it return the error"Concert exception caught: IloAlgorithm cannot extract extractables 82, 25, 31, 37, 43, 49, 55, 61 and 67"。

    • so,what should I do next to fix this error?






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  • 2.  RE: Help! How can i put logarithms into an optimization goal,with error"Concert exception caught: IloAlgorithm cannot extract extractables"

    Posted 09/11/20 12:52 PM

    Hello,

    This function is for use with CP Optimizer.

    https://www.ibm.com/support/knowledgecenter/SSSA5P_12.10.0/ilog.odms.cpo.help/refcppcpoptimizer/html/functions/IloLog.html

    If you try to extract your model with Cplex, you'll receive this exception.

    I hope this clarifies,

    Chris






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