Dear members of the list,

I'm a beginner in R and I'm having some trouble with: "Error in
optim(init[mask], armafn, method = "BFGS", hessian = TRUE, control =
optim.control,  :
  non-finite finite-difference value [8]"

when running "arima".

I've seen that some people have come accross the same problem:
https://stat.ethz.ch/pipermail/r-help/2008-August/169660.html

So I'd like to modify the code of arima to change the optimization function
with another one that handles these problems automatically , however I don't
find the way to do it and
http://tolstoy.newcastle.edu.au/R/e6/help/09/01/2476.html points out a way
that doesn't work for me:

* If I type edit(arima) and I modify it, changes are not saved,
* If I copy the code and I save it like a different function, I get the hard
error: "Error in Delta %+% c(1, -1) : object "R_TSconv" not found"

Anybody can give me a hint? I miss matlab's easy way of doing this ("edit
function.m").

Thanks in advance

MarC (Acompany)

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