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Delivery - Data input from file; infeasibility analysis Description A simple supply and demand network example showing data
input from file and the use of "views": incremental
definition of arrays of variables. Also uses constraint
templates with the arrays of variables. A second version of this model (file xbdlvriis) has modified data making the problem infeasible. This example shows how to analyze infeasibility with the help of IIS (irreducible infeasible sets), it retrieves the IIS and prints out their contents. It is possible to retrieve more detailed information on the IIS, such as isolation rows or bounds, using Xpress Optimizer functions (file xbdlvriis2iso) or to use the infeasibility repair functionality of the Optimizer (file xbdlvriis2rep) with models defined in BCL.
Source Files By clicking on a file name, a preview is opened at the bottom of this page.
Data Files cost.dat
! Delivery Problem
! Data File: cost.dat
!
! Table COST: Unit transportation cost
!
!
! TO London Livpol Doncst York Hull Manchr Shffld ! FROM
0.0, 6.3, 7.1, 9.4, 8.2, 10.2, 3.1 ! London
3.4, 8.8, 6.1, 7.9, 3.2, 6.5, 8.1 ! Luton
14.2, 13.5, 16.4, 7.4, 8.5, 5.6, 9.0 ! B'ham
15.6, 22.4, 19.7, 16.5, 17.1, 18.2, 0.0 ! Bristl
12.4, 18.6, 26.3, 31.2, 15.7, 21.4, 12.9 ! Derby
37.3, 23.4, 18.6, 16.4, 13.2, 19.1, 31.0 ! Stckpt
14.5, 19.7, 21.6, 18.3, 23.9, 28.4, 23.7 ! York
19.6, 5.6, 12.9, 15.2, 0.0, 13.6, 15.4 ! Derby
18.4, 9.3, 17.1, 22.5, 26.3, 28.5, 31.6 ! Soton
9.4, 18.2, 15.6, 17.1, 33.9, 5.3, 17.0 ! Scnthp
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