topic Re: Do loops in SAS Programming

Do loops

Sama1 — Thu, 28 Dec 2017 06:13:59 GMT

Hi

I’m recently started learning SAS so need help with do loops

A dataset of 1000 observations , use a do loop to output every 100 observations in to new dataset

Thanks

Re: Do loops

Kurt_Bremser — Thu, 28 Dec 2017 08:18:09 GMT

Use the mod() function on the automatic variable _N_ in a subsetting if.

To get more information, do google searches on

SAS mod function

SAS _n_ variable

SAS subsetting if

Re: Do loops

Astounding — Thu, 28 Dec 2017 11:25:45 GMT

To do this is easy. But to do it using a DO loop is not as easy, and not really a "beginner's" problem. For example:

data want;

do _n_=100 to _nobs_ by 100;

set have point=_n_ nobs=_nobs_;

output;

end;

stop;

run;

Accomplishing this without a DO loop is relatively easy and a more appropriate problem:

data want;

set have;

if mod(_n_, 100) = 0;

run;

Even so, most beginners would find this method challenging.

Re: Do loops

Sama1 — Thu, 28 Dec 2017 12:18:53 GMT

Thank you