Date:         Wed, 14 Mar 2007 22:08:34 -0400
Reply-To:     Amy Sun <tonyliang20032@GMAIL.COM>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         Amy Sun <tonyliang20032@GMAIL.COM>
Subject:      if _n_ = 1
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Hi, all;

I am confused about the output for the following code

data ee;
input c d;
cards;
34 5
35 34
46 75
;
data new;
put 'a:' _all_;
if _n_ = 1 then set ee;
put 'b:' _all_;

proc print data = new;
run;

output:

Obs     c    d
 1     34    5
 2     34    5

Question: why there are two records in the output? How to interpret this?

Thank you in advance for your suggestions.

Amy