Franco Peschiera

Hello! You're right, we do not have that documented in pulp. Personally, although I more or less understand the purpose, I've never used `LpConstraintVar` so I'm not the best candidate....

Have you taken a look at the column generation examples in PuLP? https://github.com/coin-or/pulp/blob/master/examples/CGcolumnwise.py https://github.com/coin-or/pulp/blob/master/examples/CG.py The first one uses `LpConstraintVar`. I'm sorry I can't be of more help.

Hello, thanks for the suggestion, which is definitely relevant. There are many parts to the answer. First of all, are you sure the time is spent in the writing of...

Hello everyone! The problem probably is with pulp. The functionality is quite recent and although we have tested it with some mps files we probably have not done an exhaustive...

I actually adapted the pysmps code to pulp (as can be seen in https://github.com/coin-or/pulp/blob/d273841cd70fdacfa00eb8d68213334e997973ce/pulp/mps_lp.py#L33 ). This may imply that whatever is wrong in pulp, it's also in pysmps. On Wed,...

Can you try generating the mps file from the pulp "instance" object in your code and compare it with the original file ? So you can see if something is...

@tkralphs , regarding adding pysmps as a dependancy: I agree it would definitely be a better option. I don't remember why I didn't do it at the time but I...

Here comes my analysis so far. As always, it's a mix of things. I've only played with the last mps you shared (the small one). **Load an mps with minimization**...

@tkralphs I checked the pysmps project and remembered the main reason why I did not add it as dependency: they have `numpy ` as dependency which I find kind of...

@tkralphs I've opened an issue at `pysmps` https://github.com/jmaerte/pysmps/issues/6 and things are moving. I hope we manage to integrate it to pulp soon.