Overview
Enhancements to the NETFLOW procedure include the following:
-
The TOLTOTDINF and
TOLTOTPINF
options have been added to the
NETFLOW and RESET statements for controlling when the Interior Point
algorithm considers that the total dual and primal infeasibilities have been
reduced to an amount close enough to zero so that from then on
infeasibilities are no longer used in the computations.
-
The PRINTLEVEL2 option has been added to the
NETFLOW and RESET statements to indicate that information regarding
Interior Point optimization convergence is output to the SAS log.
-
There are several new options that allow you to specify when Interior
Point optimization should stop, and when optimization should continue
when the usual stopping criteria are met.
See the "Stopping Criteria" section for details.
-
When solving a network problem (by either the Simplex or Interior
Point algorithms) and the network's total supply differs from the
total demand, PROC NETFLOW attaches an _EXCESS_ node to
the network to either supply or demand the difference.
The way the _EXCESS_ node is attached is now fully documented.
See the "Balancing Total Supply and Total Demand" section for details.
-
More details about the Interior Point algorithm used by the NETFLOW
procedure
are provided in the "Interior Point Algorithmic Details" section.
Copyright © 2000 by SAS Institute Inc., Cary, NC, USA. All rights reserved.