Initializing help system before first use

problem.getlastbarsol

Purpose
Obtains the last barrier solution values following optimization that used the barrier solver.
Synopsis
barsolstatus = problem.getastbarsol(x=None, slack=None, duals=None, djs=None)
Arguments
x 
Array of length problem.attributes.cols where the values of the primal variables will be returned. May be None if not required.
slack 
Array of length problem.attributes.rows where the values of the slack variables will be returned. May be None if not required.
duals 
Array of length problem.attributes.rows where the values of the dual variables ( cBTB-1) will be returned. May be None if not required.
djs 
Array of length problem.attributes.cols where the reduced cost for each variable ( cT-cBTB-1A) will be returned. May be None if not required.
barsolstatus 
Status of the last barrier solve. Value matches that of the lpstatus attribute if the solve stopped immediately after the barrier.
Further information
1. If the barrier solver has not been used, barsolstatus will return xpress.lp_unsolved.
2. The barrier solution or the solution candidate is always available if the status is not xpress.lp_unsolved.
3. The last barrier solution is available until the next solve, and is not invalidated by otherwise working with the problem.
Related topics
problem.getSolution

Parent Topic Xpress problem methods

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