Write Solution to a .SOL File

[stumarcus314]

Is it possible to have SCIP.jl write the solution to a .SOL file by setting an optimizer attribute?

m = JuMP.Model()
[...]
    JuMP.set_optimizer(m, SCIP.Optimizer)
    JuMP.set_optimizer_attribute(m, "SolutionFile", "result.sol")
    JuMP.optimize!(m)

[matbesancon]

Not directly, but you can use SCIPprintBestSol on the SCIP.Optimizer See https://stackoverflow.com/questions/43399199/how-can-i-store-the-results-into-a-text-file for the SCIP function API. As an alternative, you can extract the values from JuMP and produce the SOL file yourself, for example looping over all variables and adding the name and value to your file.

…

On Tue, Feb 25, 2025, 18:54 stumarcus314 ***@***.***> wrote: Is it possible to have SCIP.jl write the solution to a .SOL file by setting an optimizer attribute? m = JuMP.Model() [...] JuMP.set_optimizer(m, SCIP.Optimizer) JuMP.set_optimizer_attribute(m, "SolutionFile", "result.sol") JuMP.optimize!(m) — Reply to this email directly, view it on GitHub <#302>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AB2FDMQ4VZMM6JDTURZNVJT2RSU57AVCNFSM6AAAAABX3IWSBGVHI2DSMVQWIX3LMV43ASLTON2WKOZSHA3TSMJWGU2TGMA> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***> [image: stumarcus314]*stumarcus314* created an issue (scipopt/SCIP.jl#302) <#302> Is it possible to have SCIP.jl write the solution to a .SOL file by setting an optimizer attribute? m = JuMP.Model() [...] JuMP.set_optimizer(m, SCIP.Optimizer) JuMP.set_optimizer_attribute(m, "SolutionFile", "result.sol") JuMP.optimize!(m) — Reply to this email directly, view it on GitHub <#302>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AB2FDMQ4VZMM6JDTURZNVJT2RSU57AVCNFSM6AAAAABX3IWSBGVHI2DSMVQWIX3LMV43ASLTON2WKOZSHA3TSMJWGU2TGMA> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[stumarcus314]

Can you provide an example using JuMP how to call SCIPprintBestSol on the SCIP.Optimizer?

[matbesancon]

m = Model(SCIP.Optimizer)
# build problem
optimize!(m)
open("mysol.sol", "w") do f
           SCIP.LibSCIP.SCIPprintBestSol(JuMP.backend(m).optimizer.model, Libc.FILE(f), true)
end