On 9/26/2005 7:34 AM, [EMAIL PROTECTED] wrote: > Full_Name: Jussi Jousimo > Version: 2.2.0 beta > OS: Windows XP > Submission from: (NULL) (193.167.195.60) > > > I'm trying to assign a zero length vector to a list: > > x<-numeric() > length(x) > foo<-list() > foo$bar[[1]]<-x > length(foo$bar[[1]]) > foo > > But in the list this vector turns out to be length one with random content. > x<-character() makes R to crash.
After foo<-list(), foo$bar is NULL, so we can simplify this. Here's a simpler version: # These work, which is a bit of a surprise, but there is some inconsistency: one x becomes a list, the other is numeric: > x <- NULL > x[[1]] <- 1:10 > x [[1]] [1] 1 2 3 4 5 6 7 8 9 10 > x <- NULL > x[[1]] <- 1 > x [1] 1 # This generates the same bug as the above: > x <- NULL > x[[1]] <- numeric(0) > x [1] 4.250083e-314 It looks like we're trying to be too clever with handling assignments to components of NULL. Wouldn't it make more sense for those to generate an error? Duncan Murdoch ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
