AliasMethod

Implementation of Walker's Alias method by Elixir. The algorithm is principally useful when you need to random sampling with replacement by O(1).

Installation

defdepsdo[{:alias_method,"~> 0.1.0"}]end

Example

iex>weights=[1,1,8]iex>table=AliasMethod.generate_table(weights)iex>table%AliasMethod.Table{alias_table: %{0=>2,1=>2,2=>0},length: 3,probability_table: %{0=>0.3,1=>0.3,2=>1.0}}iex>n=AliasMethod.choice(table)iex>0<=n&&n<=table.lengthtrue

License

This project is licensed under the MIT License - see the LICENSE file for details

Author

Tomochika Hara - thara