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# problem.setcbdrcol

Purpose
This subroutine is deprecated and will be removed in a future release.
Set a user callback used to override the update of variables with small determining column
Synopsis
`

problem.setcbdrcol(callback, data)

newvalue = callback(my_prob, my_object, colindex, drcolindex, drcolvalue, vlb, vub)

`
Arguments

callback | The function to be called after each column has been cascaded. callback 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.
my_prob | The problem passed to the callback function.
my_object | The user-defined object passed as data to setcbcascadevar.
ColIndex | The column (i.e., xpress.var object, index, or name) for which the determining columns is checked.
DrColIndex | The index of the determining column for the column that is being updated.
DrColValue | The value of the determining column in the current SLP iteration.
NewValue | 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.
VLB | 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.
VUB | 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.
data | A user-defined object, which can be used for any purpose by the function. data is passed to callback as my_object.

Further information
If set, this callback is called as part of the cascading procedure. Please see the chapter on cascading of the SLP Reference Manual for more information.
Related topics
xslp_DRCOLTOL, problem.slpCascadeSol, problem.setcbcascadeend, problem.setcbcascadestart
Parent Topic Deprecated functionality

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