XSLPsetcbdrcol
XSLPsetcbdrcol |
Purpose
Set a user callback used to override the update of variables with small determining column
Synopsis
int XPRS_CC XSLPsetcbdrcol(XSLPprob Prob, int (XPRS_CC *UserFunc) (XSLPprob myProb, void *myObject, int ColIndex, int DrColIndex, double DrColValue, double * NewValue, double VLB, double VUB), void *Object);
Arguments
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Prob
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The current SLP problem.
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UserFunc
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The function to be called after each column has been cascaded.
UserFunc returns an integer value. If the return value is positive, it will indicate that the value has been fixed, and cascading should be omitted for the variable. A negative value indicates that a previously fixed value has been relaxed. If no action is taken, a 0 return value should be used.
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myProb
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The problem passed to the callback function.
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myObject
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The user-defined object passed as
Object to
XSLPsetcbcascadevar.
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ColIndex
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The index of the column for which the determining columns is checked.
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DrColIndex
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The index of the determining column for the column that is being updated.
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DrColValue
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The value of the determining column in the current SLP iteration.
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NewValue
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Used to return the new value for column
ColIndex, should it need to be updated, in which case the callback must return a positive value to indicate that this value should be used.
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VLB
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The original lower bound of column
ColIndex. The callback provides this value as a reference, should the bound be updated or changed during the solution process.
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VUB
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The original upper bound of column
ColIndex. The callback provides this value as a reference, should the bound be updated or changed during the solution process.
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Object
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Address of a user-defined object, which can be used for any purpose. by the function.
Object is passed to
UserFunc as
myObject.
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Further information
If set, this callback is called as part of the cascading procedure. Please see Chapter
Cascading for more information.
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