MIDRANGE dot COM Mailing List Archive



Home » MIDRANGE-L » September 2002

RE: ceerano and the seed



fixed

Dejavu all over again?


------------
Walden H Leverich III
President
Tech Software
(516) 627-3800 x11
(208) 692-3308 eFax
WaldenL@TechSoftInc.com
http://www.TechSoftInc.com

Quiquid latine dictum sit altum viditur.
(Whatever is said in Latin seems profound.)



-----Original Message-----
From: Joel Fritz [mailto:JFritz@sharperimage.com]
Sent: Monday, September 16, 2002 19:07
To: MIDRANGE-L@midrange. com (E-mail)
Subject: ceerano and the seed


We've been playing with CEERANO to try to construct a list of 13 digit
unique numbers in "random" order.  It looks like that after 20,000 or so,
diminishing returns sets in in a big way.

What we're doing is starting with zero as the seed and using whatever gets
returned in the seed parm as the next seed.  The test program looks at its
output file to see if the current random number is in the file.  If not, it
writes it.  Out of curiosity I tried a run of 99,999--off by 1 <g>--just to
see what I'd get.  1322 of the numbers occurred 70 times, 29 of them
occurred 69 times, and the others occurred once.  I guess I'd expect the
frequencies to be a little more normally distributed.

Looks like using the seed value returned by the function is not a good idea.
Does anyone know what's happening here?
NOTICE:
All e-mail sent to or from this e-mail address will be received or otherwise
recorded by The Sharper Image corporate e-mail system and is subject to
archival, monitoring, review by and/or disclosure to Sharper Image security
and other management. This message is intended only for the use of the
addressee and may contain information that is privileged and confidential.
The contents of this message may contain personal views which are not the
views of The Sharper Image. If you are not the intended recipient,
dissemination of this communication is prohibited.
_______________________________________________
This is the Midrange Systems Technical Discussion (MIDRANGE-L) mailing list
To post a message email: MIDRANGE-L@midrange.com To subscribe, unsubscribe,
or change list options,
visit: http://lists.midrange.com/cgi-bin/listinfo/midrange-l
or email: MIDRANGE-L-request@midrange.com
Before posting, please take a moment to review the archives
at http://archive.midrange.com/midrange-l.






Return to Archive home page | Return to MIDRANGE.COM home page

This mailing list archive is Copyright 1997-2014 by MIDRANGE dot COM and David Gibbs as a compilation work. Use of the archive is restricted to research of a business or technical nature. Any other uses are prohibited. Full details are available here. If you have questions about this, please contact