Hi, The R input/output after the following paragraph is from a session with version.string R version 2.4.0 Patched (2006-11-23 r39958).
The last element, x$c, of x has no value and after the assignment of x to the formals of f, x$c does not become a formal argument of f. The second assignment does the job. It seems that x$c actually becomes the body of f after the first assignment. There is no problem if the body of f is not NULL (this probably explains why the second time the assignment to the formals of f works as expected. > x <- alist(a=,b=,c=) > x$b <- 4 > f <- function(x) NULL > f function(x) NULL > formals(f) <- x > f function (a, b = 4) > formals(f) <- x > f function (a, b = 4, c) > body(f) -- Dr Georgi Boshnakov tel: (+44) (0)161 306 3684 School of Mathematics fax: (+44) (0)161 306 3669 The University of Manchester email: [EMAIL PROTECTED] Sackville Street Manchester M60 1QD UK ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
