[Scip] Fractional Solution

[Bahareh Eghtesadi]

Dear all,

I am implementing a b&p algorithm. In my problem, I have a set of binary
variables (beside  the decomposition variables) in my master problem, call
them psi,  for which I have a branching rule. In my branching rule, the
options for constructor is:
ObjBranchrule( scip, name, "branchs on Original vars", 50000 , -1 , 1.0)

I also want to check the integrality of the original variables(call x). For
that, I have a conshdlr with following options:

ObjConshdlr(scip, name, "....",-10000 , 50000 , 10000, -1,  -1 , 1 , 0 ,
FALSE , FALSE , FALSE , FALSE , SCIP_PROPTIMING_BEFORELP)

In this conshdlr, in the CONSENFOLP method, I find the values of the
original variables and if they are not integer, I call SCIPcreateChild.

However, in the optimal solution, all the psi variables are binary, but the
original variables are continuous. The objective function value is also
less than the optimal obj. value(I already know it).
I have tried to track down the b&b tree, and it seems whenever all the
binary variables(psi) are binary, it takes it as the optimal solution
eventhough there are some fractional x.
I also changed the priority of the conshdlr to be less than the branching
rule's. Then, the same solution is caught with less number of
nodes(quicker).

I am not sure how to check what happens after the psi s are binary, and why
it doesnt go to the CONSENFOLP method after that. Is there a reason for
happening this?
I attached the output file with statistics and the branching statistics.

Thanks in advance.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://listserv.zib.de/pipermail/scip/attachments/20150726/380d19da/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: branching statistics
Type: application/octet-stream
Size: 1000 bytes
Desc: not available
URL: <http://listserv.zib.de/pipermail/scip/attachments/20150726/380d19da/attachment.obj>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: results
Type: application/octet-stream
Size: 16308 bytes
Desc: not available
URL: <http://listserv.zib.de/pipermail/scip/attachments/20150726/380d19da/attachment-0001.obj>