[Scip] error message on calling SCIPwriteLP

[Shahin Gelareh]

The code is the following --very simple.

> I use VS2010. The same result under Ubuntu.
>


> regards,
> Shahin
>
>
> /**@file   triKnapsack.c
>  * @brief  The first example for solving a three-constraint knapsack
> problem
>  * @author Shahin Gelareh
>  *
>  * This example shows how to setup and solve the model using SCIP as
> callable library.
>  *
>
>
> /*--+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/
>
> #include <stdio.h>
>
> //#include "scip/scip.h"
> //#include "scip/scipdefplugins.h"
> /* include SCIP components */
> #include "objscip/objscip.h"
> #include "objscip/objscipdefplugins.h"
>
> #include <iostream>
> #include <sstream>
> #include <string>
> #include <vector>
> using namespace scip;
> using namespace std;
>
> string itos(int arg) //converts an integer to a std::string
> {
>     ostringstream buffer;
>     buffer << arg;
>     return buffer.str();
> }
>
>
> /** main method starting SCIP */
> int main(
>    int                        argc,          /**< number of arguments from
> the shell */
>    char**                     argv           /**< array of shell arguments
> */
>    )  /*lint --e{715}*/
> {
>    SCIP_RETCODE retcode;
>    SCIP* scip; // create the null pointer to SCIP
>    SCIP_CALL(SCIPcreate(&scip)); // initialize the SCIP instance
>
>    SCIP_CALL(SCIPincludeDefaultPlugins(scip)); // load the default plugins
>    // create an empty problem
>    SCIP_CALL(SCIPcreateProb(scip, "triKnapsack", NULL, NULL, NULL,
>                               NULL, NULL, NULL, NULL
>    ));
>    SCIP_CALL(SCIPsetObjsense(scip, SCIP_OBJSENSE_MAXIMIZE));
>
>    std::vector<SCIP_VAR*> var(3);
>    for(int i = 0; i < 3; i++)
>    {
>    string name = "x[" + itos(i) + "]";
>    SCIP_CALL(SCIPcreateVar(scip, &var[i], (const char*)name.c_str(),
> 0.0, 1.0, i+1, SCIP_VARTYPE_BINARY,
>                   TRUE, FALSE, NULL,
>  NULL, NULL, NULL, NULL));
>    SCIP_CALL(SCIPaddVar(scip, var[i]));
>    }
>    std::vector<SCIP_CONS*> cons(3);
>    for(int i = 0; i < 3; i++)
>    {
>    string name = "const[" + itos(i) + "]";
>    SCIP_CALL(SCIPcreateConsLinear(scip, &cons[i], (const
> char*)name.c_str(), 0.0,
>  NULL, NULL, 0, 3+i,
>                   TRUE, TRUE, TRUE, TRUE, TRUE,
>                   FALSE, FALSE, FALSE, FALSE, FALSE
>                         ));
>
>    }
>    SCIP_CALL(SCIPaddCoefLinear(scip, cons[0], var[0], 2));
>    SCIP_CALL(SCIPaddCoefLinear(scip, cons[0], var[1], 3));
>    SCIP_CALL(SCIPaddCoefLinear(scip, cons[0], var[2], 4));
>
>    SCIP_CALL(SCIPaddCoefLinear(scip, cons[1], var[0], 3));
>    SCIP_CALL(SCIPaddCoefLinear(scip, cons[1], var[1], 4));
>    SCIP_CALL(SCIPaddCoefLinear(scip, cons[1], var[2], 5));
>
>    SCIP_CALL(SCIPaddCoefLinear(scip, cons[2], var[0], 4));
>    SCIP_CALL(SCIPaddCoefLinear(scip, cons[2], var[1], 5));
>    SCIP_CALL(SCIPaddCoefLinear(scip, cons[2], var[2], 6));
>    // solve
>    SCIP_CALL(SCIPsolve(scip));
>    SCIP_CALL(SCIPwriteLP(scip, "triKP"));
>    // FILE* f=fopen("tri", "w");
>
>    //SCIP_CALL(SCIPprintOrigProblem(scip,f, "lp", 0));
>
>
>
>    if( SCIPgetNSols(scip) > 0 )
>    {
>    SCIPinfoMessage(scip, NULL, "\nSolution:\n");
>    SCIP_CALL( SCIPprintSol(scip, SCIPgetBestSol(scip), NULL, FALSE) );
>    }
>
>    SCIP_CALL( SCIPfree(&scip) );
>
>    return SCIP_OKAY;
> }
>
>
>
> On Tue, Oct 1, 2013 at 2:03 PM, Ambros Gleixner <gleixner at zib.de> wrote:
>
>> Hello Shahin,
>>
>> you need to give us some more details.   Can you compile SCIP in debug
>> mode (make OPT=dbg), run everything in a debugger, and send us the
>> backtrace?
>>
>> Also, how and where exactly do you call SCIPwriteLP()?
>>
>> Best regards,
>>
>> Ambros
>>
>>
>> Am 01.10.2013 13:41, schrieb Shahin Gelareh:
>>
>>> Dear SCIPers
>>>
>>> I build my model and it solves fine.
>>> I need to extract the LP model to verify my mode.
>>>
>>> When I call it for the first time I get no output and at the same time
>>> no error message.
>>> The next time I run the executable it crashes :(
>>>
>>> Anything I am missing here?
>>>
>>> Best
>>> Shahin
>>>
>>> --
>>>
>>>
>>>
>>>
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>
>
>
> --
>
>
>


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