[Scip] soplex unable to parse LP file generated by zimpl

[Gerald Gamrath]

Dear George,

it seems like you don't have a pure LP, but also some quadratic
constraints inside your problem. For example, the constraint that SoPlex
complains about contains the product of RadioAirtime#1 and RadioLossRate#1.

You can model this with ZIMPL and it is even possible to express this
problem as an LP file, but it is not purely linear anymore.

Therefore, SoPlex cannot solve it, but you need to use SCIP for that.
Was there any particular reason why you wanted to use SoPlex instead of
SCIP? If so, we might find a way to do the same within SCIP.

Best,
Gerald

On 26.07.2013 10:13, George Nychis wrote:
> I am trying to run an LP file through soplex that was generated by
> zimpl.  However, when I try to I get:
>
> Loading LP file spectrum_optimization.lp
> ELPFRD15 Syntax error in line 205
> error while reading file "spectrum_optimization.lp"
>
> This points to the following lines:
>
>  airtime_eq_re at 19:
>   - RadioAirtime#1 + GoodAirtime#1
>   + [ + RadioAirtime#1 * RadioLossRate#1 ]  <--- line 205
>  = 0
>
> I've attached the zmpl files and the lp output.  I am able to run this
> through scip using both of these commands:
> scip -f spectrum_optimization.zpl
> scip -f spectrum_optimization.lp
>
> So, something seems to be wrong when parsing with soplex.   I'd
> greatly appreciate any help.
>
> Thanks!
> George
>
>
>
>
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