Nothing
`drawEdges` <-
function(a,far=1000) {
lns<-makeEdges(a)
p<-dim(lns)[1]; n<-dim(a)[1]
for (i in 1:p) {
ee<-lns[i,3:4]; ff<-lns[i,5:6]
xlw<-lns[i,7]; if (xlw == -Inf) xlw<--far
plw<-ee+xlw*ff
xup<-lns[i,8]; if (xup == Inf) xup<-far
pup<-ee+xup*ff
lines(rbind(plw,pup),col="RED")
}
}
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