[SCIP] make branching constraints show up in the visualization(visual/vbcfilename) of the branching tree

[Gregor Hendel]

Hi Myroslav,

You have certainly already figured out yourself that scip/visual.c is 
the file that is responsible for all vbc or bak file output. You can 
modify the way that branching decisions are printed as string. Input a 
string version of your marker constraint.

Without looking into the code of vbc2dot, I assume that it may have 
problems to process such custom branching decision output. In the case 
that it doesn't, you will have to modify the corresponding place in that 
script, too.

Happy visualizing,
Gregor

Am 07.09.2018 um 09:32 schrieb myroslav:
> Dear SCIP community,
>
>
> I have a branch and price algorithm and I am adding some constraints 
> when doing branching at a node in particular I have a "marker" 
> constraint handler that stores  a single constraint for each branching 
> decision whose data has information about the branching decision. I 
> visualize the branching tree using visual/vbcfilename parameter which 
> makes scip making a vbc file which I then convert to .dot using 
> vbc2dot tool and visualize the branching tree using graphviz. I 
> wondered how I could make my marker constraints show up in the 
> visualization. Since I have just one marker constraint per one branch, 
> this should be possible, just like in the default variable scip 
> branching.
>
> Thanks,
> Myroslav
>
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