Nothing
#Chebyshev norm
mSolver<-function(z, a, extra) {
x <- z
if ((is.null(extra$weights)) || (is.null(extra$y))) stop("mSolver needs the additional arguments y and weights!")
w<-extra$weights
z<-extra$y
n<-length(z)
if (length(a)==0) return(list(x=z,lbd=NULL,f=0,gx=rep(0,n)))
if (is.vector(a)) a<-matrix(a,1,2)
indi<-mkIndi(a,n)
m<-ncol(indi); h<-rep(0,m)
for (j in 1:m) {
ij<-which(indi[,j]==1)
zj<-z[ij]; wj<-w[ij]
h[j]<-weightedMidRange(zj,wj)
}
y<-drop(indi%*%h); dv<-w*(y-z)
i1<-which.max(dv); i2<-which.min(dv)
f<-max(abs(dv))
gy1<-rep(0,n); gy1[i1]<-w[i1]
lbd1<-mkLagrange(a,gy1)
gy2<-rep(0,n); gy2[i2]<--w[i2]
lbd2<-mkLagrange(a,gy2)
lbd<-(w[i2]*lbd1+w[i1]*lbd2)/(w[i1]+w[i2])
gy<-(w[i2]*gy1+w[i1]*gy2)/(w[i1]+w[i2])
return(list(x = y, lbd = lbd, f = f, gx = gy))
}
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