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dirkschumacher / ompr

R package to model Mixed Integer Linear Programs
https://dirkschumacher.github.io/ompr/
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MINLP still using ompr? #164

Closed MelissaLe44 closed 6 years ago

MelissaLe44 commented 6 years ago

Hello, I would like to use ompr, but my objective function is non-linear, having a component like a/a+b. First question: is there a "trick" to transform this component into a linear one, so that I can use one of the solvers in ompr (e.g glpk). (I already used a trick for the absolute value, creating two constraints) If not, would you recommend me any R solver (package/function) to solve my MINLP problem?

Thanks a lot for your answers. FYI, please find attached my MINLP problem. revengineeringMIP.docx

Regards, Mélissa

dirkschumacher commented 6 years ago

I think we discussed this on twitter.

For the rest: ompr does not support non linear programming. See the package ROI or the solvers listed at neos-server (https://neos-guide.org/content/mixed-integer-nonlinear-programming)

MelissaLe44 commented 6 years ago

you are right thanks a lot, my next step is then to use the package rneos on my MINLP problem. Thanks for your support. Best Mélissa

Yogitha785 commented 6 years ago

Hello Melissa, I am trying to solve a similar problem where my objective function is non-linear and i have some binary constraints. It would be very helpful if you can let me know any package that worked for you.

Thank you Yogitha