[Cbc] Fwd: Fwd: please help

[Christos]

Here are the results:

http://imageshack.us/g/1/9793476/


-------- Original Message --------
Subject: 	Fwd: please help
Date: 	Thu, 04 Oct 2012 12:41:47 +0300
From: 	Christos <chtsolak at gmail.com>
To: 	cbc at list.coin-or.org <cbc at list.coin-or.org>



I am asking you because i have a big problem. With very small alteration 
in data operation time goes from 9' to 65' !!!

Any recommendations on the way i solve the model?
Do you think that the above times are normal for such a model?


-------- Original Message --------
Subject: 	please help
Date: 	Wed, 03 Oct 2012 13:13:03 +0300
From: 	Christos <chtsolak at gmail.com>
To: 	cbc at list.coin-or.org <cbc at list.coin-or.org>



Hi all,

i am a student in the final phase of the Milp model which i want to solve.

So, i have a milp model
columns: 46614
integers:  12540 (binary)
rows:        40842
nonzeros:117823

I tried these simple methods
1.
/solver1.loadProblem(numcols, numrows, start, index, value, collb, 
colub, obj, rowlb, rowub);
solver1.initialSolve();
solver1.branchAndBound() ;/
2.
/solver1.loadProblem(numcols, numrows, start, index, value, collb, 
colub, obj, rowlb, rowub);
CbcModel model(solver1);
CbcMain0(model);
const char * argv2[]={"DAS","-solve","-quit"}; /-> _i don't know what 
this do._/
CbcMain1(3,argv2,model);

/Since i am an amateur, can you help me?
What method should i use to solve the model? 1,2 or something else?
Any recommendations?

The 1st takes an hour and stops.
The 2nd takes either 8' or 35' depending on the data.

Your help is much appreciated.

Christos





-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://list.coin-or.org/pipermail/cbc/attachments/20121004/0e5fb621/attachment.html>