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Issue 1681432: Add triangular distribution the random module.

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This commit is contained in:
Raymond Hettinger 2008-03-23 13:32:32 +00:00
parent 9a0d3462fc
commit bbc50eafe5
4 changed files with 31 additions and 1 deletions
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2
Lib/test/test_random.py
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@ -488,6 +488,7 @@ class TestDistributions(unittest.TestCase):
g.random = x[:].pop; g.gammavariate(1.0, 1.0)
g.random = x[:].pop; g.gammavariate(200.0, 1.0)
g.random = x[:].pop; g.betavariate(3.0, 3.0)
g.random = x[:].pop; g.triangular(0.0, 1.0, 1.0/3.0)
def test_avg_std(self):
# Use integration to test distribution average and standard deviation.
@ -497,6 +498,7 @@ class TestDistributions(unittest.TestCase):
x = [i/float(N) for i in xrange(1,N)]
for variate, args, mu, sigmasqrd in [
(g.uniform, (1.0,10.0), (10.0+1.0)/2, (10.0-1.0)**2/12),
(g.triangular, (0.0, 1.0, 1.0/3.0), 4.0/9.0, 7.0/9.0/18.0),
(g.expovariate, (1.5,), 1/1.5, 1/1.5**2),
(g.paretovariate, (5.0,), 5.0/(5.0-1),
5.0/((5.0-1)**2*(5.0-2))),