The NETFLOW Procedure

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.