R igraph manual pages

Sampling a random integer sequence

Description

This function provides a very efficient way to pull an integer random sample sequence from an integer interval.

Usage

sample_seq(low, high, length)

Arguments

low	The lower limit of the interval (inclusive).
high	The higher limit of the interval (inclusive).
length	The length of the sample.

Details

The algorithm runs in O(length) expected time, even if high-low is big. It is much faster (but of course less general) than the builtin sample function of R.

Value

An increasing numeric vector containing integers, the sample.

Author(s)

Gabor Csardi csardi.gabor@gmail.com

References

Jeffrey Scott Vitter: An Efficient Algorithm for Sequential Random Sampling, ACM Transactions on Mathematical Software, 13/1, 58–67.

Examples

rs <- sample_seq(1, 100000000, 10)
rs

---