Nothing
`spatial.median.step` <-
function(y,datas)
{
datas.y <- sweep(datas,2,y)
eta.y <- 1-as.numeric(apply(datas.y,1,setequal,rep(0,length(y))))
if (sum(eta.y)==0) stop("all observations are equal")
d.y <- norm(datas.y)
T.tilde.y <- (sum(1/d.y[eta.y==1]))^(-1)*colSums((sweep(datas[eta.y==1,],1,d.y[eta.y==1],"/")))
if (length(eta.y)==length(eta.y[eta.y==1])) {
y.new <- T.tilde.y
} else {
R.tilde.y <- colSums((sweep(datas.y[eta.y==1,],1,d.y[eta.y==1],"/")))
r.y <- sqrt(sum(R.tilde.y^2))
s.eta.y.r <- (length(eta.y) -sum(eta.y))/r.y
y.new <- max(c(0,(1-s.eta.y.r)))*T.tilde.y+ min(c(1,s.eta.y.r))*y
}
return(y.new)
}
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