The erros of using RAPOSa(https://raposa.usc.es) based on AmplNLWriter

Specific Domains Optimization (Mathematical)
1

using JuMP, AmplNLWriter
m = Model(() → AmplNLWriter.Optimizer(“raposa”))
@variable(m, 1 <= x <= 10 )
@variable(m, 0 <= y <= 8 )
@NLobjective(m, Min, x^2 + y^2 + x )
@NLconstraint(m, x*y >= 1.0 )
optimize!(m)

@show value(x)
@show value(y)

solution_summary(m)

The above code shows that
" Errors calling the solver. Failed with: Base.IOError(“could not spawn raposa /tmp/jl_NWfK3R/model.nl -AMPL: no such f:ile or directory (ENOENT)”, -2)"

I try to do " raposa /tmp/jl_NWfK3R/model.nl " in command of Linux, and it is OK. So what’s wrong with it and how to fix it?

thanks.

1 Like
2

Firstly ,you should do.

Insert RAPSOa path

export PATH=/path_name/RAPOSa_4.2.0_Ubuntu20:$PATH

in .bashrc and then
$> source .bashrc

1 Like
3

Instead of modifying the PATH, just provide the full path to AmplNLWriter.Optimizer:

using JuMP, AmplNLWriter
model = Model(() -> AmplNLWriter.Optimizer("/path_name/RAPOSa_4.2.0_Ubuntu20/raposa"))
4

Actually, it is the same and but the messages of error are different.

using JuMP, AmplNLWriter
# m = Model(() -> AmplNLWriter.Optimizer("raposa"))
# m = Model(() -> AmplNLWriter.Optimizer("raposa",["-outlev=1","-maxtime=60"]))
m = Model(() -> AmplNLWriter.Optimizer("/home/USER_NAME/RAPOSa_4.2.0_Ubuntu20/raposa"))

@variable(m, 1 <= x <= 10 )
@variable(m, 0 <= y <= 8 )
@NLobjective(m, Min, x^2 + y^2 + x )
@NLconstraint(m, x*y >= 1.0 )
write_to_file(m, "exampleRAPOSa00.nl")
optimize!(m)

The error:
-integrated_ipopt_dir is not a valid option.

and i can do it with raposa /tmp/jl_NCKJlw/model.nl.

Global solution found after 1 iterations and 0.16508 seconds.
Objective: 3

So i don’t know why and there are some errors out of my mind. it 's sad for it.

5

Just quickly, it’s much easier to read if you can start and end copied code and terminal output using three back ticks: ```

6

Ok, thanks

7

What happens if you call raposa /tmp/jl_NCKJlw/model.nl -AMPL