model = Model () leads to error message "NameError: name 'cbclib' is not defined"

[Oliver Ewald]

Hi,

I am a beginner with Python-MIP on my Macbook Pro. I installed MIP with "pip install mip". When I run the example code on the "Resource Constrained Project Scheduling Problem" (RCPSP) from the Python -MIP homepage (https://python-mip.readthedocs.io/en/latest/examples.html) I get the following error message after processing the line "model = Model ()": "Osi_getNumCols = cbclib.Osi_getNumCols

NameError: name 'cbclib' is not defined".

What could be a solution to that error?

Thank you very much!

Regards,

Oliver 

[Haroldo Gambini Santos]

Hello Oliver,

It is probably the case that the CBC binaries provided by Python-MIP are
not compatible with yoiur version of Mac-OS. Maybe you could try to
install CBC from source ?:

https://docs.python-mip.com/en/latest/install.html#using-your-own-cbc-binaries-optional

Cheers

--
=============================================================
Haroldo Gambini Santos
Department of Computer Science
Universidade Federal de Ouro Preto - UFOP
email: har...@ufop.edu.br
home/research page: www.decom.ufop.br/haroldo

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[Oliver Ewald]

Hi Haroldo,

thanks for your help, but I don't get it properly installed. I followed the instructions here to install it on macOS: 

https://coin-or.github.io/user_introduction

Running "brew tap coin-or-tools/coinor" works fine.

But after running "brew install coin-or-tools/coinor/Xyz" I get the following error messages:

Error: No available formula with the name "coin-or-tools/coinor/xyz" 

==> Searching for a previously deleted formula (in the last month)...

Error: No previously deleted formula found.

==> Searching for similarly named formulae...

Error: No similarly named formulae found.

What am I doing wrong?

Regatta,

Oliver