Re: [Gretl-devel] Adding observations within a function

Well yes and no. It would be impossible to write a function package to do forecasting because of the limitations. So "asking the user to go for (a)" in this context would seem to imply you cannot use a contributed package as with other applications, instead the user has to do at least some of the prep work herself. I guess it is conceivable in principle that the out-of-sample range itself becomes an argument of the function call: Suppose gretl had a new sample-range object type. Then the user/caller could supply the sample-to-be-added as an argument to the function that does some out-of-sample forecasting. That way the responsibility of "mucking" with the dataset remains with the caller, but the function would be capable of producing out-of-sample results.