public void getOldList(GRBModel model, GRBConstr constr)
{
model.Update();
GRBLinExpr linExpr = model.GetRow(constr);
oldDict = new Dictionary<GRBVar, double>();
for (int i = 0; i < linExpr.Size; i++)
{
GRBVar var = linExpr.GetVar(i);
double val = linExpr.GetCoeff(i);
if (oldDict.ContainsKey(var))
{
oldDict[var] += val;
}
else
{
oldDict[var] = val;
}
}
constrs = new GRBConstr[1];
constrs[0] = constr;
}