This seems to give me a poisson distribution:

prd=: _0.5 >[EMAIL PROTECTED] ] {. [ }. [ +//.@([EMAIL PROTECTED]@[EMAIL 
PROTECTED] 0:)@, 1 + ] + 2*[

For example,

   require 'plot'
   plot poissonrand 100 1e5
   plot /:~ 100 prd 1e5
   ts=:6!:2,7!:[EMAIL PROTECTED]
   ts '100 prd 2e6'
2.48258 2.24815e9

-- 
Raul
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