Hi John, Thank you for the information. I just forward this to the mailing list to share the information with others. Regards, Peng On Tue, Aug 11, 2009 at 9:31 AM, Prof. John C Nash<nashjc at="" uottawa.ca=""> wrote: > Keep asking the questions. > > There was far too much noise about your question before someone suggested > "example()". Even though I've been using R for a while, I did not remember > this useful tool. It should be mentioned more in the manuals. > > Best wishes, > > John Nash >