[Cbc] Newbie question about use of CBC and how to specify integraly constraints?

[Jonatan Knud Lauritsen]

Regarding use of cbc. I understand that problem can be loaded and saved from and to MPS file using commands import and export. But what are commands for displaying and exporting to file the results of optimization, specifically - the values of variables?

     Den 15:25 torsdag den 17. marts 2016 skrev Jonatan Knud Lauritsen <jonatan.lauritsen at yahoo.dk>:
 

 
 

Hi!
I am starting to use CBC. I need integer linear programming solver and apparently CBC is the right software from the COIN-OR projects (I am not sure about Symphony project, maybe it can solve integer linear programs as well). I am confused how to use CBC. I expected cbc.dll, but there is only cbc.exe available. I am trying to use cbc.exe, I managed to import and solve problem but I don't understand how to get results back - e.g. how to see (and save to file) values of the variables? That is the first question.
The second question is - is there cbc.dll available? I found CoinMP.dll and tried to use it, but it seems to me an completely incomplete project. E.g. after importing and preparing problems, the getColCount and getRowCount returns zero values. One can see in the source code that lot of methodes simply return dummy value and does nothing. So - how CBC is intended to use? My impression is that CBC is simple collection of source files and one should combine, integrate them and build them as one needes, there is no ready dll (apart from cbc.exe, which is not quite suitable to be embedded in other software as it works as interactive session and not as input-output program).
The third question is about mps file format which I am using. How to specify integrality constraints on variables in this file format? Maybe cbc automatically assumes that all the unkown variables will be integers? wikipedia mentions that MPS extensions are suitable for specifying integrality constraints but do CBC supports such extensions and where they ar documented?
Thanks in advance!


   

   
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