Date: Fri, 1 Dec 2006 10:21:50 -0500
Reply-To: "Wainwright, Andrea" <andrea.wainwright@CAPITALONE.COM>
Sender: "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From: "Wainwright, Andrea" <andrea.wainwright@CAPITALONE.COM>
Subject: Re: Evaluating an IF/THEN in the negative?
In-Reply-To: A<MPG.1fd8842df4f9e1759896ff@news.cle.sbcglobal.net>
Content-Type: text/plain; charset="us-ascii"
In the first example you needed AND.
IF (MISSING(VAR1) = 0 AND VAR1 NE 0)
Says if it isn't missing AND it isn't 0.
When negating you need and not or. (A AND B)=NOT(NOT A OR NOT B)
A B A and B not A not B not A or not B not(not A or not B)
-------------------------------------------------------------
T T T F F F T
T F F F T T F
F T F T F T F
F F F T T T F
-----Original Message-----
From: SAS(r) Discussion [mailto:SAS-L@LISTSERV.UGA.EDU] On Behalf Of
Paula Sims
Sent: Thursday, November 30, 2006 10:35 PM
To: SAS-L@LISTSERV.UGA.EDU
Subject: Evaluating an IF/THEN in the negative?
Hi everyone,
I came across an interesting "issue" last week and was wondering why it
worked one way but not the other.
Here's a bit 'o the code:
IF (MISSING(VAR1) = 0 OR VAR1 NE 0) THEN RESULT1 = ABC/VAR1; ELSE
RESULT1 = 999999999999999;
The evaluation worked correctly for the MISSING part but not for the
VAR1 NE 0. However, I adjusted the code to
IF (MISSING(VAR1) OR VAR1 = 0) THEN RESULT1 = 999999999999999; ELSE
RESULT1 = ABC/VAR1;
and everything thing worked wonderfully every time in both situations.
Why???
Thanks
Paula
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