Resolved in Gurobi v10.0.3: General Constraints in R

Affected versions: v9.0.x, v9.1.x, v9.5.0, v9.5.1, v9.5.2, v10.0.0, v1 0.0.1 , v10.0.2
Resolved in version: Gurobi v10.0.3

Issue

The R language uses a pattern-matching system that might conflict with how Gurobi specifies some general constraints.

Whenever you are using genconlogistic , genconloga, or genconexpa, you should also add an empty genconlog or genconexp to avoid misinterpretations of the constraint type. This is due to the common base of the names of those lists.

Workaround

To address the issue in the meantime, follow the steps below:

• When using genconlogistic, add an empty genconlog in case there are no natural logarithmic constraints in the problem
• When using genconloga, add an empty genconlog in case there are no natural logarithmic constraints in the problem
• When using genconexpa, add an empty genconexp in case there are no natural exponential constraints in the problem 

An example implementation of adding an empty natural logarithmic or exponential constraints in the Gurobi R API is given below:

model$genconlog <- list()
model$genconexp <- list()