Nothing
# From Yplant (leaf.makeviewbound in Dpunit.pas)
acosangle <- function (a, b) {
alen <- sqrt(sum(a^2))
blen <- sqrt(sum(b^2))
acosnum <- abs(sum(a*b))
if(alen > 0)ang <- acosnum / alen
if(blen > 0)ang <- acosnum / blen
return(ang)
}
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