add fishman-moore pseudo random number generator (#177)

Author: tomooda

src/Math-Random/PMFishmanMooreRandomGenerator.class.st

@@ -0,0 +1,41 @@
+"
+I am a simple implementation of Fishman-Moore pseudo-random number generator.
+
+Onghena, P. A theoretical and empirical comparison of mainframe, microcomputer, and pocket calculator pseudorandom number generators. Behavior Research Methods, Instruments, & Computers 25, 384–395 (1993). https://doi.org/10.3758/BF03204529
+"
+Class {
+	#name : #PMFishmanMooreRandomGenerator,
+	#superclass : #PMPseudoRandomNumberGenerator,
+	#category : #'Math-Random'
+}
+
+{ #category : #initialization }
+PMFishmanMooreRandomGenerator >> initialize [
+	super initialize.
+	seed := Time millisecondClockValue
+]
+
+{ #category : #accessing }
+PMFishmanMooreRandomGenerator >> next [
+	^ (seed := 742938285 * seed \\ 2147483647) / 2147483647.0
+]
+
+{ #category : #accessing }
+PMFishmanMooreRandomGenerator >> nextInt: anInteger [
+	^ (self next * anInteger) truncated + 1
+]
+
+{ #category : #accessing }
+PMFishmanMooreRandomGenerator >> peek [
+	^ 742938285 * seed \\ 2147483647 / 2147483647.0
+]
+
+{ #category : #accessing }
+PMFishmanMooreRandomGenerator >> seed [
+	^ seed
+]
+
+{ #category : #accessing }
+PMFishmanMooreRandomGenerator >> seed: anInteger [
+	seed := anInteger asInteger
+]

src/Math-Tests-Random/PMFishmanMooreRandomGeneratorTest.class.st

@@ -0,0 +1,16 @@
+Class {
+	#name : #PMFishmanMooreRandomGeneratorTest,
+	#superclass : #TestCase,
+	#category : #'Math-Tests-Random'
+}
+
+{ #category : #tests }
+PMFishmanMooreRandomGeneratorTest >> testNext [
+	| random expectedNumbers |
+	random := PMFishmanMooreRandomGenerator new.
+	random seed: 2147483646.
+	expectedNumbers := #(0.6540424017 0.2032902977 0.1634123433 0.0948051145 0.1617738056 0.6769099178 0.4410270808 0.0819611824 0.3259203002 0.9101976547).
+	(1 to: expectedNumbers size)
+		with: expectedNumbers
+		do: [ :i :expected | self assert: random next closeTo: expected ]
+]