`elassens` <-
function(A,k,l){
rank <- dim(A)[1]
ea <- eigen.analysis(A)
lambda <- ea$lambda1
s <- ea$sensitivities
skl <- s[k,l]
d2 <- secder(A,k,l)
delta.kl <- matrix(0,nrow=rank,ncol=rank)
delta.kl[k,l] <- 1
es <- (A/lambda) * d2 - (A/lambda^2) * s*skl + delta.kl * s/lambda
return(round(es,4))
}
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