[R] A question about optim function in R

[Zixuan Qi]

Hi,

I encounter a problem in R. My program is as follows.
lower <- c(-Inf,-Inf,-Inf,-Inf,0,0,0,-1,-1,-1)
upper <- c(Inf,Inf,Inf,Inf,Inf,Inf,Inf,1,1,1)
out <- optim(parm,logLik,method='L-BFGS-B',lower=lower,upper=upper,hessian=hessian)

As you can see, I have restricted parameter[5], parameter[6] and parameter[7] to be greater than 0, but the program error is shown in the attached picture ('产生' means 'produce'). The reason for this error seems to be the limit in the function does not work. I don't know why.

Can you help me? Thanks very much!.

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