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returns TRUE [the order] or FALSE [NULL] according that nbn is a chain of not [according to order].
TRUE
FALSE
nbn
order
is8nbn8chain(nbn, order=FALSE)
A logical(1) when order si TRUE if not the resulting chain order versus NULL.
logical(1)
The nbn object to consider.
When FALSE the answer to the question is returned with TRUE or FALSE. When TRUE the chain order of the nodes is returned if it is a /chain/ else NULL.
NULL
is8nbn8chain(rbmn0nbn.01); is8nbn8chain(rbmn0nbn.04);
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