nvj@fys.ku.dk
2002-Dec-12 00:17 UTC
[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 + 1generates 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 + 1Warning 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