hello there,
I am trying to install and use Couenne on Windows 10 so I can use it in my Julia program, Does anyone has experience with installing solvers. It is my first time to do something like that. What I understand is that I have to go through the steps on Git Hub and that this solver is not found under any name in julia library, is that correct?
GitHub Link:
https://github.com/coin-or/Couenne
I have no experience with Couenne but I think https://github.com/rdeits/CouenneNL.jl is what you’re looking for.
This is what I was looking for
Thank you
Alternatively, download Couenne from here: Open Source Solvers - AMPLAMPL and use it with https://github.com/jump-dev/AmplNLWriter.jl.
Thank you @odow
general question pls …with JuMP
I need to define a NL expression that included the real part of an imaginary expression, but I get this message " Unrecognized function “real” used in nonlinear expression."
This means that real can not be used with JuMP ?! right and what can I do instead ?
You cannot use complex numbers with JuMP. You need to use the rectangular or polar form.
Aha…I see
Thanks
I downloaded the 64bit windows binaries from ampl.com , yet I got this error msg when I tried running the .exe 
m = JuMP.Model(() → AmplNLWriter.Optimizer(“C:/Users/mayar.madboly/Downloads/couenne-win64”))
I have put my path to couenne but I get a strange error msg saying that .Optimizer is not defined !!
m = JuMP.Model(JuMP.with_optimizer(“C:/Users/mayar.madboly/Downloads/couenne-win64.exe”, print_level =0))
Optimizer constructor is invalid…error msg
What is the output of ] add AmplNLWriter@0.6.0?
The full syntax should be
model = Model(
() -> AmplNLWriter.Optimizer(
"C:/Users/mayar.madboly/Downloads/couenne-win64/couenne.exe"
)
)
assuming you extracted the couenne-win64.zip so the path matches.
I had the same problem on windows.
Its a C++ redistributable issue, related to couenne compilation on windows.
If you look online for VCRUNTIME140_1.dll error there is a bunch of forum entries.
I solved my issue downloading: Microsoft Visual C++ Redistributable for Visual Studio 2015, 2017 and 2019.
from here:
One of these:
might be enough.
I have seen on AMPL WEBSITE a vide explaining how to use the AMPL ide with the ampl language…
Have you considered this as an option to use the couenne solver or even other solvers?
I am new to julia and I want to decide either to continue on julia or switch to another language
What do you think?
@odow
@joaquimg
Note that AMPL is a commercial product. Your university may have licenses though.
I’m somewhat biased with my preference for JuMP over AMPL…
About usage explanations,
You can check: https://github.com/jump-dev/JuMPTutorials.jl for many tutorial, they complement the docs Introduction · JuMP very well.
For a video intro: JuMP-dev 2019 | Juan Pablo Vielma | Introductory Tutorial on Julia and JuMP - YouTube
(might be slightly out of date, you can double check in the manual if something does not go smoothly)
About suggestions same here… I would alway go for JuMP, but just like @odow, I am biased…
About the IDE, I like VSCode with the julia extension: GitHub - julia-vscode/julia-vscode: Julia extension for Visual Studio Code
@odow @joaquimg
I am stuck here: What does that mean…I tried typing export in my cmd but it didnot work
Add the BARON_EXEC environment variable pointing to the BARON executable (full path, including file name as it differs across platforms).
https://docs.oracle.com/en/database/oracle/r-enterprise/1.5.1/oread/creating-and-modifying-environment-variables-on-windows.html#GUID-DD6F9982-60D5-48F6-8270-A27EC53807D0
I have windows OS
Is that what I have to do ?
@odow @joaquimg
decided to start with BARON and move to COUENNE
This is what I made to add the variable
I still get error when trying to build BARON
“Error building BARON:
│ ERROR: LoadError: Unable to locate BARON executable. Make sure the solver has been separately downloaded, and that you properly set the BARON_EXEC environment variabl”
