Initializing help system before first use

problem.getCallbackPresolveRedCosts

Purpose
Returns the reduced costs from the solution to the presolved problem associated with the current callback.
Topic areas
Solution, Callback, Optimizer
Synopsis
djs = problem.getCallbackPresolveRedCosts(first=0, last=COLS-1)
Arguments
first 
First column whose reduced cost to return.
last 
Last column whose reduced cost to return.
Return value
djs 
Double array of length last-first+1 containing the reduced costs of the variables.
Further information
1. Column indices should be in the range 0 to COLS- 1.
2. See problem.getCallbackSolution for a list of callbacks where this function can be called. Note that reduced costs are not available in all contexts where a primal solution is available.
3. Arguments first, last may contain xpress.var objects instead of indices.
Related topics
problem.getCallbackPresolveSolution, problem.getCallbackPresolveSlacks, problem.getCallbackPresolveDuals, problem.getCallbackRedCosts, problem.getRedCosts.

Parent Topic Methods of the class problem

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