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Overview:

Many kinds of data can be represented as a field of nodes connected by links. It is sometimes useful to know whether a set of nodes is contiguous, in the sense that all nodes can be traversed without leaving the set. This paper presents a SAS macro program that can be used to verify whether this is so. It begins with a data set containing the full field of nodes and links. This is then reduced to a data set containing only the set of interest and the links internal to the set. It then attempts to trace links from an arbitrarily chosen reference node to every other node in the set. If this can be done, the set is contiguous.

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Format:PDFSize:60 KB
Date:Feb 2009
Pages:7

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