[Coin-bcpdiscuss] Adding new cut when branching

[niklaus.eggenberg at epfl.ch]

Hi everybody, 
 
I am trying to branch on cuts rather than variables in my problem. No hudge 
problem so far, but I just realized that I didn't know how to include these new 
cuts... I know they must be added to vector "new_cuts" of object 
BCP_lp_branching_object in append_new_vars, and I suppose the coefficients have 
to be set in vars_to_cols?! 
But what I don't know is how to set a different cut for different children: 
suppose I want to branch on cut A_ij x_i = c (in the actual solution, c 
fractionnal) and set two new cuts 
 
         A_ij x_i <= floor(c) 
 
and      A_ij x_i >= ceil(c) 
 
Now how does this work? I am writing the function "append_branching_vars" but 
this is no help so far... 
I mean, I am not "really" generating a cut (only as it is implied by 
branching), so using generate_cut_in_lp() is not convinient.