# [Haskell-cafe] ANNOUNCE: game-probability-1.1

Neil Brown nccb2 at kent.ac.uk
Wed Sep 8 05:20:21 EDT 2010

```Hi,

I've just released version 1.1 of my game-probability library.  It's
intended to be an easy way to investigate the probability of various
dice rolls and card draws (the latter is the new addition for the 1.1
release), using a Haskell library/EDSL.  It has various examples in the
documentation, plus a few blog posts on its design (all links below).

Docs (while waiting for Hackage to generate):
http://twistedsquare.com/game-probability-1.1/
Blog posts:

As a quick taster, below are some examples of using the library.

Showing the probabilities of a dice roll prints out a bar chart -- here
is the sum of two six-sided dice:

>  show (2 * d6)
2 : #
3 : ##
4 : ###
5 : ####
6 : #####
7 : ######
8 : #####
9 : ####
10: ###
11: ##
12: #

Querying probabilities of the outcomes of dice rolls:

>  chancePred (>= 16) (3*d6)
5 % 108

The chance of drawing different numbers of Copper cards in a starting
hand of 5 drawn from 7 Copper and 3 Estate (this is from the card game
Dominion):

>  chanceMap (makeCards \$ replicate 7 "Copper" ++ replicate 3 "Estate") (drawCount (== "Copper") 5)
fromList [(2,1 % 12),(3,5 % 12),(4,5 % 12),(5,1 % 12)]

Thanks,

Neil.
```