[R] In optim() function, second parameter in par() missing

[colstat]

Hi,
First time using the optim(), can someone please tell me what I am doing
wrong?  The error looks like this

Error in .Internal(pnorm(q, mean, sd, lower.tail, log.p)) : 
  'sd' is missing


An example of the error
dat = c(20, 19, 9, 8, 7, 4, 3, 2)
dat_mu=mean(dat)
dat_s=sd(dat)

max.func = function(dat, mu, sd) {
    pnorm(dat, mu, sd)
}

optim(fn=max.func, dat=dat, par=c(mu=dat_mu, s=dat_s))

I get sd is missing error.  If I wrote par=c(s=dat_s, mu=dat_mu) , then it
tells me mu is missing.  Can someone please help?

Thanks!

Colin


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