[Cbc] lp file solve with missing variables

[Luís Borges de Oliveira]

Hello Andres,

On 18-01-2017 11:06, andres.botero at siemens.com wrote:
>
> Dear cbc List members,
>
> I am trying to solve the following problem (see lp string) with the 
> precompiled binary implementation of cbc from command line with
>
> "cbc LPfile.lp solve solu result.txt"
>
> and save the results to result.txt.
>
> I have read the syntax conventions for the lp format and have tested 
> them but there seems to be something I am missing.
>
> Namely for the problem at hand the solver computes a solution but some 
> of the variables are omitted. See the result.txt string.
>

By default, CBC will only print non-zero variables. You may change this 
behaviour using the printingOptions parameter:

    cbc -import Always6.lp -solve -printingOptions all -solution result.txt

should do what you were expecting. Note that solutions will often have 
many more zero variables than non-zero variables, so it's usually more 
efficient to not print zeros and have your solution reader default to 
zero for variables that are committed.

Cheers,
Luís
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