Nothing
# Approximate l_1
eSolver<-function(z, a, extra) {
x <- z
if ((is.null(extra$weights)) || (is.null(extra$y)) || (is.null(extra$eps))) stop("eSolver needs the additional arguments y, weights, and eps!")
w <- extra$weights
z <- extra$y
eps <- extra$eps
fobj<-function(x) sum(w*sqrt((x-z)^2+eps))
gobj<-function(x) w*(x-z)/sqrt((x-z)^2+eps)
return(fSolver(x,a,list(fobj=fobj,gobj=gobj)))
}
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