Generating variables with Poisson Distribution

Try:

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@Kaper,

Here's my version of that:

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It differs from yours in that the loop always executes at least once.

I went back to Knuth, and his description is a little arm-waving. Any thought on which is correct?

Hi shg,
Honestly - I just made a search in my HomeCloud and in one of files there was this function.

But having a brief look (it's almost midnight here):
Initial p is 1
so

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condition could be met before first execution of loop only for e>1
but as

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it means ... for mean <0

Of course, thank you.

My pleasure :-)