Macro Variable

The NETFLOW Procedure

Macro Variable _ORNETFL

The NETFLOW procedure always creates and initializes a SAS macro called _ORNETFL . After each PROC NETFLOW run, you can examine this macro by specifying %put _ORNETFL; and see whether PROC NETFLOW ran correctly or what error or difficulty it encountered.

The value of _ORNETFL consists of four parts:

ERROR_STATUS, indicating the existence or absence of any errors
OPT_STATUS, the stage of the optimization, or what solution has been found
OBJECTIVE=objective - the total cost or profit of the current solution. If PROC NETFLOW is solving a maximal flow problem, MAXFLOW=maxflow, the amount of the current solution's maximal flow, will follow. If solving a minimal flow problem (MAXFLOW and MAXIMIZE specified at the same time), MINFLOW=minflow, the amount of the current solution's mimimal flow, will follow instead
SOLUTION, describing the nature of the current solution

The value of _ORNETFL is in the form

ERROR_STATUS=charstr OPT_STATUS=charstr OBJECTIVE=objective
SOLUTION=charstr .

Nontrailing blank characters that are unnecessary are removed. Ideally, at the end a PROC NETFLOW run, _ORNETFL would have the value:

ERROR_STATUS=OK OPT_STATUS=OPTIMAL OBJECTIVE=x 
SOLUTION=OPTIMAL

Table 4.23 has alternate values for the _ORNETFL value parts:

Table 4.23: PROC NETFLOW _ORNETFL macro values

Key word Value Meaning

ERROR_STATUS OK no errors

MEMORY memory request failed

IO input-output error

DATA error in the data

BUG error with PROC NETFLOW

SEMANTIC semantic error

SYNTAX syntax error

UNKNOWN unknown error

OPT_STATUS START no optimization has been done

STAGE_1 performing stage 1 optimization

UNCON_OPT reached unconstrained optimum,

but there are side constraints

STAGE_2 performing stage 2 optimization

OPTIMAL reached the optimum

OBJECTIVE objective total cost or profit

MINFLOW minflow if MAXFLOW MAXIMIZE specified

MAXFLOW maxflow if MAXFLOW specified

SOLUTION NONOPTIMAL more optimization is required

STAGE_2_REQUIRED reached unconstrained optimum,

stage 2 optimization is required.

OPTIMAL have determined the optimum

INFEASIBLE infeasible. No solution exists.

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Key word	Value	Meaning
ERROR_STATUS	OK	no errors
	MEMORY	memory request failed
	IO	input-output error
	DATA	error in the data
	BUG	error with PROC NETFLOW
	SEMANTIC	semantic error
	SYNTAX	syntax error
	UNKNOWN	unknown error
OPT_STATUS	START	no optimization has been done
	STAGE_1	performing stage 1 optimization
	UNCON_OPT	reached unconstrained optimum,
		but there are side constraints
	STAGE_2	performing stage 2 optimization
	OPTIMAL	reached the optimum
OBJECTIVE	objective	total cost or profit
MINFLOW	minflow	if MAXFLOW MAXIMIZE specified
MAXFLOW	maxflow	if MAXFLOW specified
SOLUTION	NONOPTIMAL	more optimization is required
	STAGE_2_REQUIRED	reached unconstrained optimum,
		stage 2 optimization is required.
	OPTIMAL	have determined the optimum
	INFEASIBLE	infeasible. No solution exists.