topic what's wrong with this macro? in SAS Programming

what's wrong with this macro?

MikeTurner — Thu, 29 Mar 2012 03:38:41 GMT

I wrote one macro as below. This macro includes two parameters. If either of them is blank, the values of the two maco variable will be specified in the macro...........But when i run %test, error will appear.....How to fix it? Thanks.

%macro test(alpha,beta);

%if &alpha eq and &beta eq %then %do;

%let &alpha=0.005;

%let &beta=0.005;

%end;

%if &alpha ne and &beta eq %then %do;

%let &beta=α

%end;

%put &alpha β

%mend;

%test()

what's wrong with this macro?

Linlin — Thu, 29 Mar 2012 04:17:19 GMT

try this one:

%macro test(alpha,beta);

%if &alpha eq and &beta eq %then %do;

%let alpha=0.005;

%let beta=0.005;

%end;

%if &alpha ne and &beta eq %then %do;

%let beta=α

%end;

%put &alpha β

%mend;

%test()

what's wrong with this macro?

manojinpec — Thu, 29 Mar 2012 10:01:50 GMT

The Problem is in statement

%let &beta=α

your are assigning the value of alpha to value of beta.the correct statement should be

%let beta=α

where you assign the value of alpha to macro variable beta.

Re: what's wrong with this macro?

Tom — Thu, 29 Mar 2012 13:47:45 GMT

There is a hole in your logic. What should the value of BETA be when only ALPHA is specified?

Assuming you want it to be 0.005 then the logic simplifies to this:

%if &beta  = %then %let beta=0.005;
%if &alpha = %then %let alpha=&beta;