Date: Fri, 31 Oct 1997 18:29:02 PST
Reply-To: TWB2%Rates%FAR@bangate.pge.com
Sender: "SAS(r) Discussion" <SAS-L@UGA.CC.UGA.EDU>
From: Tim Berryhill 3rd time <TWB2%Rates%FAR@BANGATE.PGE.COM>
Subject: Re: Comments on SASWare Ballot
William, Be careful. I am currently working with some code which takes
advantage of SAS considering any value greater than 0 to be true. With values
like A=7 and B=.03, A is true and B is true while A^=B is true (when many people
would consider A xor B to be false).
Tim Berryhill - Contract Programmer and General Wizard
TWB2@PGE.COM or http://www.aartwolf.com/twb.html
Frequently at Pacific Gas & Electric Co., San Francisco
The correlation coefficient between their views and
my postings is slightly less than 0
----------------------[Reply - Original Message]----------------------
Sent by:"William Kreuter" <billyk@FROYA.BOAT.WASHINGTON.EDU>
In article <3.0.3.32.19971028224110.0069b6e8@mail.crl.com>,
Jack Hamilton <jfh@ALUMNI.STANFORD.ORG> writes:
> My comments on some of the items on the SASWare Ballot.
> 28 provide a method for the OR operator to
> differentiate between both conditions being
> true and one of the conditions being true
> VOTE: Abstain
> COMMENT: This probably means "or" vs. "exclusive or".
> WORKAROUND: "if A xor B" can be coded as
> "if (A and not B) or (B and not A)".
No, no, no. Exclusive or should be coded as:
if A^=B
Two or three times in the past several years, I've posted an article
on sas-l entitled, "Make Your Own Logical Operators." I discuss the
most efficient ways to implement exclusive or, as well as all other
possibilities from a truth table. I'll gladly send this on request to
anyone interested, or if there seems to be interest, I'll post it
again.
--
William Kreuter, Senior Computer Specialist, University of Washington
Ctr. for Cost & Outcomes Research, 146 N. Canal St. #300, Seattle, WA 98103
billyk@u.washington.edu http://weber.u.washington.edu/~billyk/
voice or voice mail: 206-543-5007 fax: 206-543-5318 mailstop: 358853
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