[Coin-discuss] Construct a MIP problem

[Spencer Fung]

John,

 

But I am using CPLEX, can it be done the same?

 

Spencer

 

  _____  

From: coin-discuss-bounces at list.coin-or.org
[mailto:coin-discuss-bounces at list.coin-or.org] On Behalf Of John J Forrest
Sent: Saturday, March 19, 2005 1:01 AM
To: Discussions about open source software for Operations Research
Subject: Re: [Coin-discuss] Construct a MIP problem

 


Spencer, 

It should work (well if you are using Clp).  I have modified the OsiClp
unitTest to show that.  The extra code is lines 941 to 950 of
OsiClpSolverInterfaceTest.cpp. 

If you make unitTest in COIN/Osi and run unitTest you should see two mps
files "continuous" and "integer".  You will see that the continuous bounds
are all UP while the integer bounds are BV. 

John Forrest 




"Spencer Fung" <sklfung at cse.cuhk.edu.hk> 
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03/17/2005 01:32 PM 


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[Coin-discuss] Construct a MIP problem

 


 

 




Hi All, 
  
I am wondering how to construct a MIP problem by using constraint matrix. I
have done the following procedure to create a MIP problem, 
  
    si->loadProblem(*matrix, NULL, col_ub, NULL, sense, rhs, NULL); 
    si->setInteger(ctype, n_cols); 
si->writeMps("problem"); 
  
However, the column type show in "problem.mps" is still continuous. But
after invoke the branchAndBound(), the column type is changed to integer. Is
it possible to obtain an integer model before invoking the B&B? 
  
Thanks. 
  
Cheers, 
Spencer_______________________________________________
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