On Sat, 21 Jun 2003, Uwe Ligges wrote:
> Faheem Mitha wrote: > > Can you go into a little more detail here about why alpha here is a > > call? > > Thomas already told it and ?expression says as well: "expression returns > a vector of mode "expression" containing its arguments as unevaluated > ``calls''." Yes, but it is just a call by definition then? If you put anything in the place of alpha it would be a call? > > I'm not terribly clear what a call is. If it so similar to an > > expression, what distinguishes it from an expression, and why do we > > need two similar concepts like this? > > Obviously a question for Bill Venables. I admit I've not thought about > it before. In this context the article > W. N. Venables (2002). Programmer’s Niche, R News, 2(2): 24–26, > ISSN 1609-3631, http://CRAN. R-project.org/doc/Rnews/, > and > Venables & Ripley (2000): S Programming, Springer. > are nice references. I've got "S Programming" and spent some of yesterday reading it. It doesn't go into detail into the difference between expressions and calls. It does have a table on pg 66 which gives examples of different modes. Faheem. ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help