[Scip] Meaning of SPARSESOLUTION Member Data

[Hélène Toussaint]

Thank you. I spent time studing this function and I understand a little 
better but I don't succeed in extracting the solutions from the 
sparsesolution data structure :

1. I see that the SCIPdialogExecWriteAllsolutions seems to do what I 
want. Can I call it even though I don't use the interactive shell ? If 
yes how can I do ?

2. I don't find getter to access to the members of the countsols 
constraint handler so I have tried to access directly but in vain :

conshdlr = SCIPfindConshdlr(env->_scip, consHdlrName.c_str());//ok
conshdlrdata = SCIPconshdlrGetData(conshdlr); //ok
c_allvars = conshdlrdata->allvars; //not allowed

How can I access to these members ?

3. I have one constraint handler and one pricer. I wonder if it could 
involve some problems in the countsols constraint handler ? Indeed the 
number of feasible solutions returned by SCIPgetNCountedSols seems to me 
to be large.

Best regards,
Hélène


Le 24/05/2012 11:02, Stefan Heinz a écrit :
> Hi,
>
> in cons_countsols.c exist a method called writeExpandedSolutions 
> <http://scip.zib.de/doc/html_devel/cons__countsols_8c.html#a1fdec7b56aadb0cb9a21042be8ff582e>() 
> which unrolls the sparse solutions
>
> http://scip.zib.de/doc/html_devel/cons__countsols_8c.html#a1fdec7b56aadb0cb9a21042be8ff582e 
>
>
> Does that help?
>
> Stefan
>
> On 05/24/12 10:30, Hélène Toussaint wrote:
>> Hi all,
>>
>> I have tried to collect all feasible solutions generated by my BCP 
>> algorithm using SCIPcount().
>>
>> 1. I have fixed the collect parameter to TRUE like this:
>> SCIPsetBoolParam( env._scip, "constraints/countsols/collect", TRUE) ;
>>
>> 2. After solving (using SCIPcount() ) I have used the 
>> SCIPgetCountedSparseSolutions to obtain the solutions like this:
>>
>> SCIP_VAR **vars;
>> intnvars, nsols;
>> SPARSESOLUTION **sols;
>> SCIPgetCountedSparseSolutions( env._scip, &vars, &nvars,&sols, &nsols );
>>
>> I have had a look to the values stored in nsols and vars but I don't 
>> understand their meanings and so I am not able to construct the 
>> solutions. Could you please help me with these data: how can I get 
>> the solutions (objective value and variables values) ?
>>
>> Best regards,
>> Hélène
>>
>>
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>
>
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