Hello,

I have a user cut callback where I have separation routines that use the current solution from the LP to try and identify violated cuts.

My callback uses the following line to obtain the current solution:

status = CPXgetcallbacknodex(env, cbdata, wherefrom, cutinfo->x[thr], 0, cutinfo->numcols - 1);

I am running into an out of bounds error on this line

CPLEX Error 1206: CPXgetcallbacknodex: 'end' value 700 is greater than 699.
CPLEX Error 1200: Index is outside range of valid values.

in the following circumstance/setting before calling CPXmipopt:


//CPXsetintparam(env, CPX_PARAM_PRELINEAR, 0);
//CPXsetintparam(env, CPX_PARAM_MIPCBREDLP, CPX_OFF);
CPXsetintparam(env, CPXPARAM_Advance, 0);

The error goes away when the first two lines are uncommented thereby setting CPX_PARAM_PRELINEAR to 0 and CPX_PARAM_MIPCBREDLP to CPX_OFF.

Is there any documentation that specifies the interaction between these different parameter settings?

Below are the official documentation for these 3 parameter settings:

advanced start switch - IBM Documentation
linear reduction switch - IBM Documentation
MIP callback switch between original model and reduced, presolved model - IBM Documentation

I would like to gain a clearer understanding of why the error occurs.

Thanks.

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CPLEX User
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