topic Re: Scientific notation on macro in SAS Programming

Scientific notation on macro

arodriguez — Thu, 17 Sep 2015 06:37:57 GMT

Hi,

Yesterday, I was programming on macro and I realized that in a macro evaluation 10 is not equal than 1e1, but in a data step it says that they are equal.

%put %eval(10=1e1);
0

data test;
if 10=1e1 then put "1";
run;

Why happen this?

Re: Scientific notation on macro

Patrick — Thu, 17 Sep 2015 08:10:08 GMT

You need "%sysevalf()". Run the following

data _null_;
var= 10=1e1;
put var=;
run;

%put eval: %eval(10=1e1);
%put sysevalf: %sysevalf(10=1e1);

Re: Scientific notation on macro

Kurt_Bremser — Thu, 17 Sep 2015 09:52:25 GMT

The macro processor is a pure text engine, so you need to see all comparisons as character comparisons, unless you override that behaviour, as Patrick already pointed out.