sample(x, size, replace=FALSE, prob)
sample takes a sample of the specified size from
the elements of x using either with or without replacement
sampling according to the value of replace.
By default size is equal to length(x)
so that sample(x) generates a random permutation
of the elements of x.
If x has length 1, sampling takes place from
1:x.
The optional prob agrument can be used to give a vector
of probabilities of obtaining the elements of the vector being
sampled.
x <- 1:12 # a random permutation sample(x) # bootstrap sampling sample(x,replace=TRUE) # 100 Bernoulli trials sample(c(0,1), 100, replace = TRUE)