Nothing
convex.hull<-function(tri.obj, plot.it=FALSE, add=FALSE,...)
{
if(!inherits(tri.obj,"triSht"))
stop("tri.obj must be of class \"triSht\"")
ret<-list(x=tri.obj$x[tri.obj$chull],
y=tri.obj$y[tri.obj$chull],
i=tri.obj$chull)
if(plot.it)
{
if (!add)
{
plot.new()
plot.window(range(ret$x), range(ret$y), "")
}
lines(cbind(ret$x,ret$x[1]),cbind(ret$y,ret$y[1]), ...)
invisible(ret)
}
else
ret
}
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