Date:         Fri, 28 Nov 2008 09:36:46 -0500
Reply-To:     "Fehd, Ronald J. (CDC/CCHIS/NCPHI)" <rjf2@CDC.GOV>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         "Fehd, Ronald J. (CDC/CCHIS/NCPHI)" <rjf2@CDC.GOV>
Subject:      Re: What is Logic of doing something like this
In-Reply-To:  <c2192a610811271340r7871e2a9o7ab9ec803359ddc8@mail.gmail.com>
Content-Type: text/plain; charset=us-ascii

>    if a and not b then output main;
>   else if b and not a then output main;

this is xor(a,b)

if   (    a and not b)
   or(not a and     b) then ...;

the sas function is bxor: bitwise xor
see also: band: bitwise and

if bxor(a,b) then ...;

Ron Fehd  the band(logic
                  ,macro) maven  CDC Atlanta GA USA RJF2 at cdc dot gov

> -----Original Message-----
> From: owner-sas-l@listserv.uga.edu
> [mailto:owner-sas-l@listserv.uga.edu] On Behalf Of SAS_learner
> Sent: Thursday, November 27, 2008 4:41 PM
> To: SAS(r) Discussion
> Subject: What is Logic of doing something like this
>
> Hello all,
> I came around a code something like this, I did not quite
> understand why the
> author is doing something like below
>
> data main oth ;
>   merge aa1(in=a) bb1(in=b);
>   by sbjnbr pt ;
>    if a and not b then output main;
>   else if b and not a then output main;
>   if a and b then do;
>    if a then output main;
>    if b then output oth;
>   end;
> run;
>
>  if a and not b then output main ;
> Else If b and not a then Output Main ; <-- Did not get why ??
>
> and later he goes  on
>
> If A and B then do ;
>     if a then output main; <-- Again sending it to Main data set ??
>    if b then output oth;    <-- I did not this logic is this something
> saying If b not a ??
>   end;
>
>