Extract duals

[etesio]

Hi there,

I am using OMPR and CBC via the rcbc binding to solve a MILP problem.
No issues in extracting the primal for a variable cog_power[sm,t], but when I try to extract the dual variables from the OMPR solution object sol I get

get_solution(sol, cog_power[sm,t], type="dual")
Error: The solution from the solver is invalid. It is NULL or contains NAs. Maybe the solver does not export duals?

Is it because duals are not supported by RCBC, or the ROI plugin, or something else?

Thanks a lot

[dirkschumacher]

rcbc does not support column duals at the moment. I linked an issue in rcbc to this issue.