https://github.com/andresilva/pfp-scala

Probabilistic Functional Programming in Scala
https://github.com/andresilva/pfp-scala

Last synced: 12 days ago
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Probabilistic Functional Programming in Scala

• Host: GitHub
• URL: https://github.com/andresilva/pfp-scala
• Owner: andresilva
• License: mit
• Created: 2013-12-31T13:05:50.000Z (about 11 years ago)
• Default Branch: master
• Last Pushed: 2014-05-31T15:16:31.000Z (over 10 years ago)
• Last Synced: 2024-12-20T22:05:47.625Z (13 days ago)
• Language: Shell
• Size: 239 KB
• Stars: 1
• Watchers: 3
• Forks: 1
• Open Issues: 1
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
pfp-scala

=========

Probabilistic Functional Programming in Scala.

Here's an example modeling the [Monty Hall problem](http://en.wikipedia.org/wiki/Monty_Hall_problem):

```scala

sealed trait Outcome

case object Win extends Outcome

case object Lose extends Outcome

def firstChoice = uniform[Outcome, Rational].apply(Win :: Lose :: Lose :: Nil)

def switch(o: Outcome) = o match {

  case Win => certainly[Outcome, Rational](Lose)

  case Lose => certainly[Outcome, Rational](Win)

}

// Let's test both strategies

firstChoice.plot()

// Win 1/3 #################################

// Lose 2/3 ##################################################################

firstChoice.flatMap(switch).plot()

// Win 2/3 ##################################################################

// Lose 1/3 #################################

```

Based on *Probabilistic Functional Programming in Haskell, Martin Erwig and Steve Kollmansberger 

Journal of Functional Programming, Vol. 16, No. 1, 21-34, 2006* [[1]]

[1]: http://web.engr.oregonstate.edu/~erwig/papers/PFP_JFP06.pdf