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problem.setcbslpnode

problem.setcbslpnode

Purpose
Set a user callback to be called during MISLP after the SLP optimization at each node.
Synopsis

problem.setcbslpnode (callback, object)

(retval, feas) = callback (my_prob, my_object)
Arguments
callback 
The function to be called after the set-up of the SLP problem to be solved at a node. callback returns an integer value. If the return value is nonzero, or if the feasibility flag is set nonzero, then further processing of the node will be terminated (it is declared infeasible).
my_prob 
The problem passed to the callback function.
my_object 
The user-defined object passed as object to setcbslpnode.
feas 
Address of an integer containing the feasibility flag. If callback sets the flag nonzero, the node is declared infeasible.
object 
Address of a user-defined object, which can be used for any purpose by the function. object is passed to callback as my_object.
Example
The following example sets up a callback function to be executed at each node after the SLP optimization finishes. If the solution value is worse than a target value (referenced through the user object), the node is cut off (it is declared infeasible). 
objtarget = []
p.setcbslpnode (CBSLPNode, objtarget)
A suitable callback function might resemble the following: 
def CBSLPNode (my_prob, my_obj):
  lpval = my_prob.attributes.lpobjval
  return (0, (lpval < my_obj))
Further information

If a node can be cut off by the callback function, then further exploration of the node is avoided.



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