com.bnd.math.business.rand.BooleanDensityUniformDistributionProvider.scala Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of bnd-math Show documentation

The newest version!

package com.bnd.math.business.rand

import java.{lang => jl, util => ju}

import scala.collection.JavaConversions._
import scala.collection.JavaConverters._
import com.bnd.math.domain.rand.DiscreteDistribution
import com.bnd.core.util.RandomUtil

private class BooleanDensityUniformDistributionProvider extends AbstractRandomDistributionProvider[jl.Boolean](classOf[jl.Boolean]) {

    override def next = RandomUtil.nextBoolean

	override def mean = 0.5

	override def variance = 0.5

	override def nextList(size : Int) = {
	    val ones = RandomUtil.nextInt(size + 1)
	    val positions = RandomUtil.nextElementsWithoutRepetitions(size, ones)
	    val array = new Array[jl.Boolean](size)
	    (0 until size).map{ i => (positions.contains(i : Integer)) : jl.Boolean} : ju.List[jl.Boolean]
	}
}