topic Re: DATA STEP in SAS Procedures

DATA STEP

robertrao — Fri, 19 Apr 2013 21:17:46 GMT

hi,

For ex i have 4 records in a dataset.

data demog;

set have;

run;

Have dataset has these 4 records

name age

kevin 23

peter 28

louis 33

...

first the Input buffer is set blank or missing accordingly.

it reads the first observation writes to the dataset

It then goes to the beginning of the datastep. NOW how will SAS know that it has already read the first one AFTER RETURNING TO THE BEGINNING OF THE DATA STEP????

Could someone tell me the process how it works??????

Re: DATA STEP

robertrao — Fri, 19 Apr 2013 21:34:42 GMT

Sorry about that,,,I went back to my Basics and learnt that it is because of the _n_=

Re: DATA STEP

Tom — Fri, 19 Apr 2013 22:32:23 GMT

Try running this little step to see how it works in more detail.

data new;

put 'BEFORE ' _n_= age= eof=;

set have end=eof ;

put 'AFTER ' _n_= age= eof=;

run;