64 lines
1.8 KiB
JavaScript
64 lines
1.8 KiB
JavaScript
var MersenneTwister = require('../');
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var g = new MersenneTwister();
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describe('Generator', function() {
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it('Should repeat random sequence on same seed', function() {
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var seed = 123;
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g.init_seed(seed);
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var first_1 = g.random();
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var first_2 = g.random();
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g.init_seed(seed);
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var second_1 = g.random();
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var second_2 = g.random();
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first_1.should.be.exactly(second_1);
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first_2.should.be.exactly(second_2);
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});
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it('Should allow seeding via constructor', function() {
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var seed = 325;
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var g1 = new MersenneTwister(seed);
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var g2 = new MersenneTwister(seed);
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for (var i = 0; i < 5; ++i) {
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g1.random().should.be.exactly(g2.random());
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}
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});
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it('Should roughly match Python when seeded by array', function() {
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var seed1 = 0;
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var seed2 = 42;
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var g1 = new MersenneTwister([seed1]);
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var g2 = new MersenneTwister([seed2]);
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/* We should get a near exact match with Python's rng
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* when we seed by array. The code for generating
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* these comparison values is something like:
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import random
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r = random.Random(0)
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for i in range(10000000):
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x = r.random()
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if i % 1000000 == 0: print(x)
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*/
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var values1 = [0.84442, 0.34535, 0.25570, 0.32368, 0.89075];
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var values2 = [0.63942, 0.55564, 0.55519, 0.81948, 0.94333];
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for (var i = 0; i < 5000000; i++) {
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var rval1 = g1.random_long();
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var rval2 = g2.random_long();
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if (i % 1000000 == 0) {
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var idx = i / 1000000;
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rval1.should.be.approximately(values1[idx], 1e-5);
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rval2.should.be.approximately(values2[idx], 1e-5);
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}
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}
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});
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});
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