CPLEX: CPXwritemipstarts without optimize!

odow · February 9, 2024, 8:22pm

We add the mip starts inside optimize because the user might modify them at any point.

You’d need to do something similar to the code around here

jump-dev/CPLEX.jl/blob/6e0fdafc7df51bb710fb3e95f5bb7563ec984f65/src/MOI/MOI_wrapper.jl#L2748


      
          if _has_discrete_variables(model)
              varindices = Cint[]
              values = Float64[]
              for (key, info) in model.variable_info
                  if info.start !== nothing
                      push!(varindices, Cint(info.column - 1))
                      push!(values, info.start)
                  end
              end
              if length(varindices) > 0
                  ret = CPXaddmipstarts(
                      model.env,
                      model.lp,
                      1,
                      length(varindices),
                      Ref{Cint}(0),
                      varindices,
                      values,
                      Ref{Cint}(CPX_MIPSTART_AUTO),
                      C_NULL,
                  )

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CPLEX: CPXwritemipstarts without optimize!

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