The message is a warning message, (which is new), but it still works. I guess the notes could warn you a warning was coming! We might re-think this, I suggest. It began as an example that forced you to come to grips with the recycling rule, but it is a bit obsolete now. In S-PLUS 6.x it actually fails. Perhaps we don't need to be quite so thorough about this after all and use a more normal example - for example just skip the 0 in the y assignment and change the text accordingly. Bill Venables. -----Original Message----- From: nvj@fys.ku.dk [mailto:nvj@fys.ku.dk] Sent: Thursday, December 12, 2002 9:17 AM To: r-devel@stat.math.ethz.ch Cc: R-bugs@biostat.ku.dk Subject: [Rd] R-intro: Simple manipulations/Vectors and assignment (PR#2365) Full_Name: Niels Vestergaard Jensen Version: 1.6.1 OS: Linux (Mandrake 9.0) Submission from: (NULL) (62.79.36.179) The R-intro (1.6.1 (2002-11-01)) says in Simple manipulations/Vectors and assignment: "So with the above assignments the command
v <- 2*x + y + 1
generates a new vector v of length 11 constructed by adding together, element by element, 2*x repeated 2.2 times, y repeated just once, and 1 repeated 11 times." That's apparently not true:
x <- c(10.4, 5.6, 3.1, 6.4, 21.7) y <- c(x, 0, x) x
[1] 10.4 5.6 3.1 6.4 21.7
y
[1] 10.4 5.6 3.1 6.4 21.7 0.0 10.4 5.6 3.1 6.4 21.7
v <- 2*x + y + 1
Warning message:
longer object length
is not a multiple of shorter object length in: 2 * x + y
Which was run first thing after starting R in a dir without .Rdata. I
suspect R
has been updated, but the R-intro has not kept up.
See also: http://www.zoo.ufl.edu/bolker/emd/R/R-traps.html
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