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Construction of an edgelist from a sociomatrix
sm2el(sm,directed=TRUE)
an edglist
a sociomatrix with possibly valued relations
if TRUE, only use the upper triangular part of the matrix to enumerate edges
Peter Hoff
Y<-matrix(rpois(10*10,.5),10,10) ; diag(Y)<-NA E<-sm2el(Y) el2sm(E) - Y
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