[R] confidence intervals for non-linear regression

Dear all, I am interested to calculate confidence interval for fitted values in general for non-linear regressions. Lets say we have y=f(x1,x2,..xN) where f() is a non-linear regression. I would like to calculate a confidence interval for new prediction f(a1,..,aN). I am aware of techniques

Re: [R] confidence intervals for non-linear regression

In the paste I had provided one possible solution to this, see http://n4.nabble.com/Confidence-intervals-nls-td1556487.html#a1556702 Walmes. - ..ooo0 ... ..()... 0ooo...