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The INTPOINT Procedure

HEADNODE Statement

HEADNODE variable ;
HEAD variable ;
TONODE variable ;
TO variable ;

The HEADNODE statement specifies the SAS variable that must be present in the ARCDATA= data set that contains the names of nodes toward which arcs are directed. It is not necessary to have a HEADNODE statement if the name of the SAS variable is _HEAD_ or _TO_. The HEADNODE variable must have character values.

There should be no HEAD statement if you are solving an LP.

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