problem.getlastbarsol

Purpose

Obtains the last barrier solution values following optimization that used the barrier solver.

Synopsis

barsolstatus = problem.getastbarsol(x=None, slack=None, dual=None, dj=None);

Arguments

x	Double array of length problem.attributes.cols where the values of the primal variables will be returned. May be None if not required.
slack	Double array of length problem.attributes.rows where the values of the slack variables will be returned. May be None if not required.
dual	Double array of length problem.attributes.rows where the values of the dual variables ( c_B^TB^-1) will be returned. May be None if not required.
dj	Double array of length problem.attributes.cols where the reduced cost for each variable ( c^T-c_B^TB^-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.