- data test1;
- length country $10;
- input country $ Y2001 Y2002 Y2003 Y2004;
- datalines;
- China 11 12 13 14
- Japan 21 22 23 24
- America 31 32 33 34
- England 41 42 43 44
- ;
- run;
- data test2;
- set test1;
- array arr[2001:2004] Y2001 - Y2004;
- do year=2001 to 2004;
- gdp = arr[year];
- output;
- end;
-
- keep country year gdp;
- run;
把2004改成你要的年份,应该就可以了...