Purpose
Declares a user-defined
cut manager routine, called at each
node of the Branch and Bound search.
Synopsis
int XPRS_CC XPRSsetcbcutmgr(XPRSprob prob, int (XPRS_CC *fcme)(XPRSprob my_prob, void *my_object), void
*object);
Arguments
|
prob
|
The current problem
|
|
fcme
|
The callback function which takes two arguments, my_prob and my_object, and has an integer return value. This function is called at each node in the Branch and Bound search.
|
|
my_prob
|
The problem passed to the callback function, fcme.
|
|
my_object
|
The user-defined object passed as object when setting up the callback with XPRSsetcbcutmgr.
|
|
object
|
A user-defined object to be passed to the callback function, fcme.
|
Related Controls
Integer
|
|
Number of extra matrix elements to be allowed for.
|
|
|
Number of extra rows to be allowed for.
|
Further information
1. For maximum efficiency, the space-allocating controls
EXTRAROWS,
EXTRAELEMS should be
specified by the user if their values are known. If this is not done, resizing will occur
automatically, but more space may be allocated than the user requires.
2. The cut manager routine will be called repeatedly at each node until it returns
a value of 0. The sub-problem is automatically optimized if any cuts are added or deleted.
3. The Xpress‑Optimizer ensures that cuts added to a node are automatically
restored at descendant nodes. To do this, all cuts are stored in a
cut pool
and the Optimizer keeps track of which cuts from the cut pool must be restored at each node.
Related topics
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