SAS怎么将一个宏变量分成指定变量个数的N个小宏变量啊？

JingJu11: My classmate provided the following code

1. %macro test(var, n);
   
2.         %local k c i j;
   
3.         %let k=0;
   
4.         %let c=%sysfunc(countw(&var%str( )));
   
5.         %do i =1 %to &n;
   
6.                 %let var&i=;
   
7.                 %do j=1 %to %sysevalf((&c-&k)/(&n+1-&i), c);
   
8.                         %let k =%eval(&k +1);
   
9.                         %let var&i =&&var&i %scan(&var, &k);
   
10.                         %end;        %put var&i:&&var&i;
    
11.                 %end;
    
12. %mend test;
    
13. %test(1 2 3,3)

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jingju11 发表于 2015-11-3 11:11
JingJu11: My classmate provided the following code

Some people raised a question to my friend: Any pros and cons on programming on pure macro syntax vs. using some other interfaces, such as data step or procedures? The answer is: if you can program on pure macro syntax, you should do it. Because you can place the code anywhere you want; on the other hand, doing macro programming on data step or procedures can only work wherever it is suitable. It usually works as an independent function-like unit. The bad thing for macro syntax programming is that always is hindered and complicated by macro variable masking scheme.
JingJu