[Help-glpk] Patch for writing pseudo-boolean problems

[Oscar Gustafsson]

Dear Andrew,

please find enclosed a diff with an additional API-command lpx_write_pb 
that writes an instance in (possibly normalized) Pseudo-Boolean format. It 
is also incorporated in glpsol.

The main problem so far is that the different PB solvers have qutie 
different requirements on the input. However, the normalized one follows 
the PB competition guidelines. There should probably be some checking that 
the variables are binary, but I skipped that as there might be cases where 
it may be useful.

I would also like to add two requests:

* An API-call to set the amount of available memory.
* An API-call to set a hook that is called with a tree pointer (or
  just the objective value) when a new MIP solution is found.

With best regards

Oscar Gustafsson

glpk_opb_write.patch.gz
Description: Binary data