mirror of
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105 lines
4.6 KiB
JavaScript
105 lines
4.6 KiB
JavaScript
var assert = require('assert'),
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_ = require('underscore'),
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math = require('../../../math.js');
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var testRandom = function() {
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var picked = [], count
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_.times(1000, function() {
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picked.push(math.random(-10, 10))
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})
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count = _.filter(picked, function(val) { return val < -10 }).length
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assert.equal(count, 0)
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count = _.filter(picked, function(val) { return val > 10 }).length
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assert.equal(count, 0)
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count = _.filter(picked, function(val) { return val < -8 }).length
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assert.equal(math.round(count/picked.length, 1), 0.1)
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count = _.filter(picked, function(val) { return val >= -8 && val < -6 }).length
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assert.equal(math.round(count/picked.length, 1), 0.1)
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count = _.filter(picked, function(val) { return val >= -6 && val < -4 }).length
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assert.equal(math.round(count/picked.length, 1), 0.1)
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count = _.filter(picked, function(val) { return val >= -4 && val < -2 }).length
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assert.equal(math.round(count/picked.length, 1), 0.1)
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count = _.filter(picked, function(val) { return val >= -2 && val < 0 }).length
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assert.equal(math.round(count/picked.length, 1), 0.1)
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count = _.filter(picked, function(val) { return val >= 0 && val < 2 }).length
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assert.equal(math.round(count/picked.length, 1), 0.1)
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count = _.filter(picked, function(val) { return val >= 2 && val < 4 }).length
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assert.equal(math.round(count/picked.length, 1), 0.1)
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count = _.filter(picked, function(val) { return val >= 4 && val < 6 }).length
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assert.equal(math.round(count/picked.length, 1), 0.1)
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count = _.filter(picked, function(val) { return val >= 6 && val < 8 }).length
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assert.equal(math.round(count/picked.length, 1), 0.1)
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count = _.filter(picked, function(val) { return val >= 8 }).length
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assert.equal(math.round(count/picked.length, 1), 0.1)
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}
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var testRandomInt = function() {
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var picked = []
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, count
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_.times(1000, function() {
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picked.push(math.randomInt(-15, -5))
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})
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picked.forEach(function(val) {
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assert.ok(_.contains([-15, -14, -13, -12, -11, -10, -9, -8, -7, -6], val))
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})
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count = _.filter(picked, function(val) { return val === -15 }).length
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assert.equal(math.round(count/picked.length, 1), 0.1)
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count = _.filter(picked, function(val) { return val === -14 }).length
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assert.equal(math.round(count/picked.length, 1), 0.1)
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count = _.filter(picked, function(val) { return val === -13 }).length
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assert.equal(math.round(count/picked.length, 1), 0.1)
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count = _.filter(picked, function(val) { return val === -12 }).length
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assert.equal(math.round(count/picked.length, 1), 0.1)
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count = _.filter(picked, function(val) { return val === -11 }).length
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assert.equal(math.round(count/picked.length, 1), 0.1)
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count = _.filter(picked, function(val) { return val === -10 }).length
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assert.equal(math.round(count/picked.length, 1), 0.1)
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count = _.filter(picked, function(val) { return val === -9 }).length
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assert.equal(math.round(count/picked.length, 1), 0.1)
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count = _.filter(picked, function(val) { return val === -8 }).length
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assert.equal(math.round(count/picked.length, 1), 0.1)
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count = _.filter(picked, function(val) { return val === -7 }).length
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assert.equal(math.round(count/picked.length, 1), 0.1)
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count = _.filter(picked, function(val) { return val === -6 }).length
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assert.equal(math.round(count/picked.length, 1), 0.1)
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}
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var assertInTolerance = function(testVal, val, tol) {
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var diff = Math.abs(val - testVal)
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if (diff > tol) assert.equal(testVal, val)
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else assert.ok(diff <= tol)
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}
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var testRandomNormal = function() {
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var picked = [], count, distribution = math.distribution('normal')
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_.times(100000, function() {
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picked.push(distribution.random())
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})
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count = _.filter(picked, function(val) { return val < 0 }).length
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assert.equal(count, 0)
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count = _.filter(picked, function(val) { return val > 1 }).length
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assert.equal(count, 0)
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count = _.filter(picked, function(val) { return val < 0.25 }).length
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assertInTolerance(count/picked.length, 0.07, 0.01)
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count = _.filter(picked, function(val) { return val < 0.4 }).length
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assertInTolerance(count/picked.length, 0.27, 0.01)
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count = _.filter(picked, function(val) { return val < 0.5 }).length
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assertInTolerance(count/picked.length, 0.5, 0.01)
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count = _.filter(picked, function(val) { return val < 0.6 }).length
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assertInTolerance(count/picked.length, 0.73, 0.01)
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count = _.filter(picked, function(val) { return val < 0.75 }).length
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assertInTolerance(count/picked.length, 0.93, 0.01)
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}
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testRandom()
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testRandomInt()
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testRandomNormal() |