generating random integers - microsoft.public.vb.general.discussion

Message from discussion generating random integers

Jim Mack

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More options May 16, 10:50 pm

Newsgroups: microsoft.public.vb.general.discussion

From: "Jim Mack" <jm...@mdxi.nospam.com>

Date: Fri, 16 May 2008 22:50:06 -0400

Local: Fri, May 16 2008 10:50 pm

Subject: Re: generating random integers

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Bob O`Bob wrote:
> ...or generating random Longs, whatever.

> I am unsure if I have a flawed code fragment or if I am running into
> the oft-mentioned shortcomings of VB's PRNG (psuedo-random number
> generator)

> I have a function designed to return a random integer from within
> the supplied range (inclusive) and the code looks like this:

> Private Function MyRnd(lowerbound As Long, upperbound As Long)
> As Long MyRnd= CLng((upperbound - lowerbound + 1) * Rnd +
> lowerbound) End Function

The canonical method would be Int(Rnd * (UB - LB + 1)) + LB

CLng is not recommended because of its 'even' bias, and the LB should
be added after the Int.

I'm pretty sure that's been in the MS Basic docs since forever.

--
Jim

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