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# problem.addSlpCascadeVarCallback

Purpose
Add a user callback to be called after each column has been cascaded
Topic areas
Callback, SLP, Cascading
Synopsis
`problem.addSlpCascadeVarCallback(slpcascadevar, data=None, priority=0)`
`result = slpcascadevar(cbprob, cbdata, col)`
Arguments

slpcascadevar | The function to be called after each column has been cascaded. slpcascadevar returns an integer value. If the return value is nonzero, the cascading process will be omitted for the remaining variables during the current SLP iteration, but the optimization will continue.
data | Address of a user-defined object, which can be used for any purpose by the function. data is passed to slpcascadevar as cbdata.
priority | An integer that determines the order in which callbacks of this type will be invoked. The callback added with a higher priority will be called before a callback with a lower priority. Set to 0 if not required.
cbprob | The problem passed to the callback function.
cbdata | The user-defined object passed as data to problem.addSlpCascadeVarCallback.
col | The number of the column which has been cascaded.

Return value

result | The result of the callback

Further information
This callback can be used after each variable has been cascaded and its new value has been calculated.
Related topics
problem.slpCascadeSol, problem.addSlpCascadeEndCallback, problem.addSlpCascadeStartCallback, problem.addSlpCascadeVarFailCallback problem.removeSlpCascadeVarCallback
Parent Topic Methods of the class problem

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