Thomas Leveringhaus
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Recent activity by Thomas Leveringhaus-
Transforming binary variables into integer variables during presolve
AnsweredDear Gurobi-team,I observed that Gurobi is transforming binary variables into integer variables during presolve, see the following log:Optimize a model with 174435 rows, 134010 columns and 1311832 ...
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GRBaddconstr (or other) permissible inside of #pragma omp parallel for in C?
AnsweredDear Gurobi-Team, is it permissible to add constraints (or anything else) to a model from the inside of a parallel for loop, like in the following (artificial) example in C? int ind[num_variants...
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"Error: converted symmetric Q matrix has more than two billion nonzeros" despite bilinear terms with binaries
AnsweredDear Gurobi-Team, First of all, I would like to show an excerpt from the solver log: Set parameter IntFeasTol to value 1e-06Set parameter Method to value 0Set parameter ConcurrentMethod to value 3S...
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free malloc array after GRBupdatemodel in C?
AnsweredDear Gurobi-team, I have a question regarding the C-API: I use malloc to allocate memory for the arrays for *cind, *cval in GRBaddconstr etc. Can I de-allocate the memory of the arrays with free() ...
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X-Variants (size_t) of GRBaddconstrs and GRBaddvars in C-API
AnsweredDear Gurobi-Team, do I need to use the X-Variants of the functions if I have a model with a total of more than 2 billion non-zero values, even though I do not add more than 2 billion non-zero valu...