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problem.setcbcascadevar

Purpose
Set a user callback to be called after each column has been cascaded
Synopsis

problem.setcbcascadevar(callback, data)

retval = callback(my_prob, my_object, colindex)
Arguments
callback 
The function to be called after each column has been cascaded. callback 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.
my_prob 
The problem passed to the callback function.
my_object 
The user-defined object passed as data to problem.setcbcascadevar.
colindex 
The number of the column which has been cascaded.
data 
User-defined object, which can be used for any purpose by the function. data is passed to callback as my_object.
Example
The following example sets up a callback to be executed after each variable has been cascaded: 
obj = []
p.setcbcascadevar(CBCascVar, obj)
The following sample callback function resets the value of the variable if the cascaded value is of the opposite sign to the original value: 
def CBCascVar(myprob, obj, iCol):
(a,b,c,d,e,f,value,g,h,i,j,k,l,m,n) = myprob.getvar(iCol)
  if value * obj[iCol] < 0:
    p.chgvar(col=ColNum, value=obj[iCol])
  return 0
The data argument is used here to hold the array cSol which we assume has been populated with the original solution values.
Further information
This callback can be used after each variable has been cascaded and its new value has been calculated.
Related topics
problem.cascade, problem.setcbcascadeend, problem.setcbcascadestart, problem.setcbcascadevarfail

Parent Topic Xpress problem methods

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