[Coin-discuss] Solicit your help on COIN-CLP

[Matthew Galati]

A quick way to become famaliar is to look at the source associated with the OsiClp interface functions:
 getBasisStatus(int* cstat, int* rstat)
 getBInvARow(int row, double* z, double * slack=NULL)
 getBInvACol(int col, double* vec);
 getBasics(int* index);

Through OsiClp, you need to first enableSimplexInterface - you can look at the source for that function to see how to set this from within Clp.

Matt


Matthew Galati -- Optimization Developer
SAS Institute -- Analytical Solutions / Operations R & D
Office R4112 O: 919-531-0332 F: 919-677-4444
URL: http://sagan.ie.lehigh.edu/mgalati/



> -----Original Message-----
> From: Haoxun Chen [mailto:haoxun.chen at utt.fr] 
> Sent: Thursday, April 15, 2004 4:19 AM
> To: coin-discuss at oss.software.ibm.com
> Subject: [Coin-discuss] Solicit your help on COIN-CLP
> 
> 
> Dear Sir:
> 
> Thank you for your providing the open source COIN for the OR 
> community. 
> COIN is a great initiative for mathematical software.
> 
> Right now, I want to use COIN-CLP to solve a mixed integer linear 
> programming problem. In the algorithm I try to develop, the 
> variable to 
> enter the basis and the variable to leave the basis for the simplex 
> algorithm solving a LP subproblem are selected according to a 
> special rule 
> designed by myself. In order to do so, I have to know the 
> whole simplex 
> tableau at each iteration of the simplex algorithm (the columns 
> corresponding to the variables of the original problem plus those for 
> artificial variables). Could you give me some advices on the 
> data structure 
> of the tableau in CLP and on which functions and classes I 
> should look into 
> in order to get my work started. It would be greatly 
> appreciated if you 
> could help me on this issue.
> 
> Best regards,
> 
> Haoxun CHEN
> Technology University of Troyes, France 
> 
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