[Coin-lpsolver] problem with deleteRows & OsiClp messages

[John J Forrest]

Anureet,

deleteRows was OK after a solve - but immediately after reading basis was 
empty.  Fixed in branches/devel.  printf line in Idiot.cpp also taken out.

John Forrest



Anureet Saxena <anureet at yahoo.com> 
Sent by: coin-lpsolver-bounces at list.coin-or.org
06/01/2007 09:53 PM

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coin-lpsolver at list.coin-or.org, anureet at yahoo.com
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Subject
[Coin-lpsolver] problem with deleteRows & OsiClp messages






hi,
 
I am facing problems with the deleteRows function of OsiClp. I am using 
the latest version of OsiClp (just updated using the subversion utility) 
on a 64 bit linux workstation.
 
The code simply reads an mps file and deletes the first row. It however 
crashes on all the mps files from MIPLIB. A simple code to reproduce this 
problem is attached, and is also available at:
 
http://www.andrew.cmu.edu/user/anureets/tmp/workspace.tgz
 
It will be very helpful if someone could point out what is going wrong.
 
Also I get the following message when I try to solve some of the linear 
programs. Can someone please tell me if this is an error or sign of 
numerical instability etc. Also, is it possible to turn these off?
 
0 - mu 1e-11, infeasibility 7078, objective 0, 1040 interior
I am already using the following settings:
 
messageHandler()->setLogLevel(0);
setHintParam(OsiDoReducePrint, true);
regards & thanks,
anureet
 
code:
 
-----------------------------------------------
 
#include "OsiClpSolverInterface.hpp"
#include <stdio.h>
#include <stdlib.h>
 
int main(int argc, char** argv) {
     if(argc!=2) {printf("Usage: %s input_file\n",argv[0]); exit(-1); }
     OsiClpSolverInterface* si=new OsiClpSolverInterface();
     si->readMps(argv[1]);
     OsiSolverInterface* tmp=si->clone(true);
     {
          int* ri=new int[1];
          ri[0]=0;
          tmp->deleteRows(1, ri);
          delete [] ri;
     }
     delete si;
     delete tmp;
}


Anureet Saxena
anureet at cmu.edu
anureet at yahoo.com

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