Initializing help system before first use

problem.getCallbackPresolveDuals

Purpose
Returns the dual values from the solution to the presolved problem associated with the current callback.
Synopsis
duals = problem.getCallbackPresolveDuals(first, last)
Arguments
first 
(optional, default 0) First row index whose dual value to return.
last 
(optional, default problem.attributes.rows-1) Last row index whose dual value to return.
Return value
duals 
A list of dual values.
Further information
1. Row indices should be in the range 0 to problem.attributes.rows-1.
2. If a presolved solution with dual values is available, returns a list of size last-first+1. If not, returns None.
3. See problem.getCallbackSolution for a list of callbacks where this function can be called.
Related topics
problem.getCallbackPresolveSolution, problem.getCallbackPresolveSlacks, problem.getCallbackPresolveRedcosts, problem.getCallbackDuals, problem.getDuals.

Parent Topic Xpress problem methods

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