[Coin-discuss] OsiCbc, CbcModel, how to disable strong branching?

[Sebastian Nowozin]

Hello,

I use Cbc 2.1.0 using COIN-OR Osi trunk with OsiCbcSolverInterface.
The MILP problem I create solves quickly and outputs finally:

Cbc0001I Search completed - best objective 1757.3, took 3356139 
iterations and 26844 nodes (1463.37 seconds)
Cbc0032I Strong branching done 135138 times (6347787 iterations), 
fathomed 0 nodes and fixed 0 variables
Cbc0035I Maximum depth 60, 1.56856e+06 variables fixed on reduced cost

Because strong branching did not seem to be effective at all, I want to 
disable it by adding this to my code:

     OsiCbcSolverInterface si;
     // ... (setup model)

     // Switch of strong branching
     CbcModel* mod = si.getModelPtr();
     mod->setNumberStrong(0);

(I have seen this in sample5.cpp in the Cbc/examples/ directory).

However, the above output remains and strong branching still seems enabled.

Am I doing something wrong?

Sebastian