Nothing
grcentral <- function(par, userfn, eps=1.0e-7, ...) {
# Central difference gradient approximation
df <- rep(NA, length(par))
teps <- 0.5 * eps * (abs(par) + eps)
for (i in 1:length(par)) {
dp <- par
dp[i]<-dp[i]+teps[i]
dm <- par
dm[i]<-dm[i]-teps[i]
df[i] <- 0.5*(userfn(dp, ...) - userfn(dm,...))/teps[i]
}
df
}
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