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Poisson generator

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Adds gen/poisson, which samples numbers from a Poisson distribution.

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Comment made by: eraserhd

user=> (gen/sample (gen/poisson 1/500) 500) (0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0) user=> (gen/sample (gen/poisson 1/5) 500) (1 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 1 0 0 1 0 0 0 0 0 0 0 0 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 1 0 0 0 1 1 0 1 0 0 0 0 0 0 0 0 0 1 0 0 0 0 1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 1 0 0 1 1 0 0 0 0 0 1 0 0 0 1 0 0 0 0 0 0 0 1 0 0 1 0 0 0 0 0 0 0 0 0 0 0 1 0 0 1 0 0 0 0 0 0 1 0 1 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 1 0 0 0 0 0 0 0 0 1 0 1 0 1 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 1 1 0 0 0 0 0 1 0 0 0 1 0 0 0 0 0 1 1 0 1 0 0 0 1 0 0 0 0 0 0 0 0 1 0 0 1 1 0 0 0 0 0 0 0 0 1 1 1 0 1 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 1 0 0 1 1 0 1 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 1 0 0 1 1 0 0 1 1 0 0 0 1 0 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 1 1 1 0 0 1 1 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 1 0 0 0 0 0 0 1 0 0 0 0 0 0) user=> (gen/sample (gen/poisson 1) 500) (2 2 1 1 1 0 2 2 0 0 0 1 0 1 2 1 2 2 2 2 1 1 2 2 0 1 2 0 0 1 1 2 1 1 0 1 2 0 1 1 0 1 1 1 0 2 2 0 2 1 1 1 0 1 1 0 0 1 2 0 1 1 1 2 0 1 1 0 0 0 0 2 2 0 1 1 2 2 0 0 1 0 2 0 0 1 2 1 1 1 1 1 2 2 0 1 0 1 1 1 0 1 0 2 1 0 1 0 1 0 0 0 2 1 1 0 0 2 0 1 2 1 0 2 1 0 1 0 0 1 1 2 1 2 0 1 1 2 0 1 1 2 1 1 0 0 2 1 2 1 0 0 2 1 1 2 0 1 2 1 1 0 2 2 1 1 2 1 1 2 0 1 0 1 0 0 0 1 2 0 2 1 1 2 1 0 1 0 0 1 1 0 1 0 1 1 2 0 0 2 1 0 2 0 1 0 2 1 1 0 2 1 0 1 1 0 1 0 2 0 0 0 0 2 1 0 0 1 1 2 1 0 2 2 2 2 0 1 2 1 0 1 1 1 2 1 0 0 1 0 0 1 2 1 0 0 0 2 2 0 1 1 1 0 2 0 0 0 1 1 1 0 0 0 2 1 2 1 0 0 2 1 1 1 2 1 1 2 2 0 1 2 1 2 2 0 0 1 2 2 0 1 1 2 0 1 1 2 1 1 1 1 0 2 2 2 1 0 1 1 0 1 2 0 1 1 1 1 2 1 0 1 2 0 0 2 1 0 2 0 0 1 0 1 1 1 2 1 1 0 0 2 1 1 1 2 2 0 0 2 1 1 1 0 0 2 2 0 1 0 1 2 1 1 0 0 0 2 0 1 1 1 2 2 1 1 0 2 1 0 1 2 1 0 0 0 1 0 0 2 1 1 0 1 2 1 1 0 2 1 0 0 0 1 2 1 1 2 1 1 0 2 0 0 2 2 1 0 2 0 2 2 2 1 1 2 0 0 0 1 0 1 2 0 2 1 2 0 1 0 1 2 1 0 1 0 1 0 0 0 1 1 2 2 0 0 2 1 1 1 2 1 1 0 2 1 2 0 0 1 0 0 1 0 1 0 0 0 1 1 1 0 1 0 1 0 0 0 0 2)

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Reference: https://clojure.atlassian.net/browse/TCHECK-72 (reported by eraserhd)
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