what's wrong with this macro?

[MikeTurner]

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()

[Linlin · Accepted solution]

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()

[manojinpec]

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.

[Tom]

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=β