[R] Optim() package restriction

[nserdar]

I did it like above  but got an error message.

> estimate<- optim(init.par,Linn,gr=NULL,method= "L-BFGS-B",
> hessian=FALSE,control =
> list(trace=1),lower=c(0,-Inf,Inf,Inf),upper=c(1,Inf,Inf,Inf))
Error in solve.default(sig[, , 1]) : 
  system is computationally singular: reciprocal condition number = 0

"how to derive constrain for only 1 variable"

Regards,
Ser

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