LWY — Sep 13, 2013, 8:16 PM
# a useful command on changing the locale:
Sys.setenv(lang="EN")
# an exercise on vectors:
x <- rnorm(5, mean=10^(1:5), sd=10^(1:5))
x
[1] -9.945 157.653 2266.535 5158.233 179833.308
y <- 1:3
z <- 3:7
y + z
Warning: longer object length is not a multiple of shorter object length
[1] 4 6 8 7 9
names(z)=letters[seq_along(z)]
z
a b c d e
3 4 5 6 7
z[c(-2,-5)]
a c d
3 5 6