igraph (version 0.7.1)

igraph.sample: 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

igraph.sample(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.

Value

  • An increasing numeric vector containing integers, 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.

References

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

Examples

Run this code
rs <- igraph.sample(1, 100000000, 10)
rs

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