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List:       sas-l
Subject:    Re: checking null string in macro
From:       Bunky <leahygNOleSPAM () PPRD ! ABBOTT ! COM ! INVALID>
Date:       2000-03-31 22:37:37
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It should be as simple as:

%IF &RAND^= %THEN %DO;
  random &RAND
%END;

Good luck!

Gerald Leahy
In article <Pine.LNX.3.96L.1000331112645.1523B-
100000@istat09.stat.wisc.edu>, Jun Yan <jyan@stat.wisc.edu>
wrote:
> Hi,
> I am trying to creat a simple macro like this,
> %macro testing(dat, mod, clas, rand)
> proc mixed data = &dat;
> class &clas;
> model &mod;
> %if length(&rand)=0 %then random &rand;
> %mend;
> I want the random statement only when &rand is not
> null, but
> length(&rand) seems not working. Is there an elegant
> way to do this?
> Jun



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