Please see the cfhub article at
http://www.cfhub.com/language/INDEX.CFM?ID=156
----- Original Message -----
From: "Caulfield, Michael" <[EMAIL PROTECTED]>
To: "CF-Talk" <[EMAIL PROTECTED]>
Sent: Friday, March 30, 2001 9:43 PM
Subject: RE: randrange()?
> >>Anyone know how ranrange() calculates it result? I am seeing some not so
> >>random results.
>
> Most random number generators work as follows (and I believe CF is no
> exception):
>
> They are given a seed number between 0 and 1
> An algorithm (call it Algorithm A) is run on that seed to produce random
> number 1
> Algorithm A is run on random number 1 to produce random number 2
> Algorithm A is run on random number 2 to produce random number 3
>
> and so on. This means of course that for the same seed, you will get the
> same sequence of "random" numbers. Hence in ColdFusion (as in most other
> languages) you have to run the Randomize function first in order to
generate
> a unique seed. If you don't, you will see the same sequence reappear.
>
> I don't know what algorithm CF uses to generate random numbers, but I do
> know it risks overflow when producing numbers over 100,000,000 with
> randRange. Hence, one of the limitations of RandRange is that for ranges
> over 100,000,000 it will produce non-random sequences.
>
> Mike.
>
>
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Structure your ColdFusion code with Fusebox. Get the official book at
http://www.fusionauthority.com/bkinfo.cfm
Archives: http://www.mail-archive.com/[email protected]/
Unsubscribe: http://www.houseoffusion.com/index.cfm?sidebar=lists
