topic Re: how to check if keyword parameter exist/is empty in SAS Programming

how to check if keyword parameter exist/is empty

somebody — Sun, 28 Oct 2018 08:17:41 GMT

say I have the following macro:

%macro test(var=);
data input; set input;
%if &var. ne %then %do; do something;%end;
%if &var. e %then %do; do something;%end;
run;
%mend;

but the check "%if &var. e" does not work.

How else should I do this?

Re: how to check if keyword parameter exist/is empty

LinusH — Sun, 28 Oct 2018 09:05:35 GMT

It's called eq, not e.

Re: how to check if keyword parameter exist/is empty

Ksharp — Sun, 28 Oct 2018 10:19:10 GMT

OR try

%macro test(var=);
data input; set input;
%if %length(&var)  %then %do; do something;%end;
%if %length(&var)=0 %then %do; do something;%end;
run;
%mend;

Re: how to check if keyword parameter exist/is empty

FreelanceReinh — Sun, 28 Oct 2018 10:33:35 GMT

For a comprehensive overview and evaluation of the available methods see the SAS Global Forum 2009 paper "Is This Macro Parameter Blank?".