Nothing
# Poisson Likelihood
sSolver <- function(z, a, extra) {
x <- z
if (is.null(extra$y)) stop("sSolver needs the additional argument y!")
z <- extra$y
fobj <- function(x) sum(x-z*log(x)) #target value
gobj <- function(x) 1-z/x #gradient
options(warn = -1)
return(fSolver(x,a,list(fobj=fobj,gobj=gobj)))
}
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