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TAILNODE Statement

TAILNODE variable ;

TAIL variable ;

FROMNODE variable ;

FROM variable ;

The TAILNODE statement specifies the SAS variable that must (when solving an NPSC problem) be present in the ARCDATA= data set that has as values the names of tail nodes of arcs. The TAILNODE variable must have character values. It is not necessary to have a TAILNODE statement if the name of the SAS variable is _TAIL_ or _FROM_. If the TAILNODE list variable value is missing, it is assumed that the observation of the ARCDATA= data set contains information concerning a nonarc variable. There should be no TAILNODE statement if you are solving an LP.