请问高手怎么使用列数代替列名（变量名）啊？谢谢！

1. /*不妨假设你的数据集在WORK集，你想做其他library的可以自行填充一些设置*/
   
2. data class;
   
3.   set sashelp.class;
   
4. run;
   
5. 
   
6. %macro column(in = , id = );
   
7. %let vc=%sysfunc(open(sashelp.vcolumn(where=(libname = 'WORK' and memname = upcase("&in.")))));
   
8. %let rc=%sysfunc(fetchobs(&vc,&id.));
   
9.   %sysfunc(getvarc(&vc,%sysfunc(varnum(&vc,name))));
   
10. %let rc=%sysfunc(close(&vc));
    
11. %mend;
    
12. 
    
13. data test;
    
14.   set class;
    
15. 
    
16.   X = %column(in = class, id = 1);
    
17. run;

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感谢楼上！