Nothing
is.clockwise = function(p) {
# Uses the shoelace formula to determine whether or not the
# vertices of a polygon are arranged clockwise
area = 0
for(i in 1:nrow(p)) {
j = i %% nrow(p) + 1
area = area + p[i,1]*p[j,2]
area = area - p[j,1]*p[i,2]
}
return (area < 0)
}
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