CPXXcallbackgetlocallb and CPXcallbackgetlocallb
The routine CPXXcallbackgetlocallb/CPXcallbackgetlocallb
retrieves the lower bound values for the subproblem at the current node
during MIP optimization from within a user-written callback.
int CPXXcallbackgetlocallb( CPXCALLBACKCONTEXTptr context, double * lb, CPXDIM begin, CPXDIM end )
int CPXcallbackgetlocallb( CPXCALLBACKCONTEXTptr context, double * lb, int begin, int end )
Description
The routine CPXXcallbackgetlocallb/CPXcallbackgetlocallb
retrieves the lower bound values for the subproblem at the current node
during MIP optimization from within a user-written callback.
The routine can only be invoked in the context CPX_CALLBACKCONTEXT_RELAXATION.
Arguments
- context
-
The callback context as passed into the callback function.
- lb
-
An array to receive the values of the lower bound values. This array must be of length at least (
end-begin+1
). If successful,lb[0]
throughlb[end-begin]
contain the lower bound values for the current subproblem. - begin
- An integer specifying the beginning of the range of lower bounds to be returned.
- end
- An integer specifying the end of the range of lower bounds to be returned.
Return
The routine returns 0 (zero) if successful and nonzero if an error occurs.Example
status = CPXcallbackgetlocallb (context, lb, 0, cols-1);