Nothing
stereo <-
function(v){
llength <- length(v)
ll <- llength + 1
s <- matrix(NA, nrow=ll, ncol=1)
for(i in 1:llength){
s[i] <- 2*v[i] / (sqrt(sum(v^2))^2 +1)
}
s[ll] <- (sqrt(sum(v^2))^2 -1) / (sqrt(sum(v^2))^2 +1)
return(s)
}
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