You have a scoping problem: the predict method needs to find the data: please supply an explicit newdata argument. Your first example works because `y' happens to be globally visible and be the right object.
On 9 Jun 2003, zhu wang wrote: > I am trying to write a function to return prediction values using > package ts. I have written three different versions since I am not sure > what's wrong with my func2. func and func1 return the same results.But > func1 and func2 don't. In particular, the only difference between > "func1" and "func2" is the function variable name being y and data, > respectively. But running the last line of the following script will > give the message: > > Error in ts(x): object is not a matrix. > > I am confused. Also, could somebody kindly let me what's the answer if > any for the following sunspot example from the package help: > > data(sunspot) > (sunspot.ar <- ar(sunspot.year)) > # why not just sunspot.ar <- ar(sunspot.year) ? Have you tried it? Please do so, and you will learn the difference! This idiom is widely used in the R help files. > predict(sunspot.ar, n.ahead=25) -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595 ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help