RandomUtils (api API)

java.lang.Object

nz.org.riskscape.engine.util.RandomUtils

public class RandomUtils extends Object

Helper functions for generating random numbers or sampling from random distributions.

Constructor Summary

Constructors

Constructor

Description

RandomUtils()
Method Summary

Modifier and Type

Method

Description

static double

getFromRange(double start, double stop)

Randomly selects a value from the given range.

static double

getNormalVariate(double mean, double stddev)

Randomly selects a value from a normal distribution with the given mean and standard deviation.

static Object

pick(List<?> items)

Picks an item randomly from the given list.

static Object

pick(List<?> items, List<Double> weights)

Picks an item based on a weighted random choice.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details
- RandomUtils
  
  public RandomUtils()
Method Details
- getNormalVariate
  
  public static double getNormalVariate(double mean, double stddev)
  
  Randomly selects a value from a normal distribution with the given mean and standard deviation. This means that values closer to the mean have a higher likelihood of being selected.
- getFromRange
  
  public static double getFromRange(double start, double stop)
  
  Randomly selects a value from the given range. Assumes values are uniformly distributed. The range is from start (inclusive) to stop (exclusive).
- pick
  
  public static Object pick(List<?> items, List<Double> weights)
  
  Picks an item based on a weighted random choice.
  
  Parameters:
  
  items - the items to choose from
  
  weights - the weighted probabilities
- pick
  
  public static Object pick(List<?> items)
  
  Picks an item randomly from the given list.