The MINCOSTFLOW statement invokes an algorithm that solves the minimum-cost network flow problem on an input graph.
The minimum-cost network flow problem is described in the section Minimum-Cost Network Flow.
You can specify the following options in the MINCOSTFLOW statement:
-
LOGFREQ=number
-
controls the frequency for displaying iteration logs for minimum-cost network flow calculations that use the network simplex
algorithm. For graphs that contain one component, this option displays progress every number simplex iterations, and the default is 10,000. For graphs that contain multiple components, when you also specify LOGLEVEL=MODERATE,
this option displays progress after processing every number components, and the default is based on the number of components. When you also specify LOGLEVEL=AGGRESSIVE, the simplex
iteration log for each component is displayed with frequency number.
The value of number can be any integer greater than or equal to 1. Setting this value too low can hurt performance on large-scale graphs.
-
LOGLEVEL=number | string
-
controls the amount of information that is displayed in the SAS log. Table 1.33 describes the valid values for this option.
Table 1.33: Values for LOGLEVEL= Option
number
|
string
|
Description
|
0
|
NONE
|
Turns off all algorithm-related messages in the SAS log
|
1
|
BASIC
|
Displays a basic summary of the algorithmic processing
|
2
|
MODERATE
|
Displays a summary of the algorithmic processing including a progress log using the interval that is specified in the LOGFREQ
option
|
3
|
AGGRESSIVE
|
Displays a detailed summary of the algorithmic processing including a progress log using the interval that is specified in
the LOGFREQ option
|
The default is the value that is specified in the LOGLEVEL=
option in the PROC OPTGRAPH statement (or BASIC if that option is not specified).
-
MAXTIME=option
-
specifies the maximum amount of time to spend calculating minimum-cost network flows. The type of time (either CPU time or
real time) is determined by the value of the TIMETYPE=
option. The value of number can be any positive number; the default value is the positive number that has the largest absolute value that can be represented
in your operating environment.