程序如下：
data score;
  input id job $ score @@;
cards;
01 chi  80 01 math 75 01 eng  95 02 chi  70 02 math 85 02 eng  92
03 chi  85 03 math 80 03 eng  94 04 chi  93 04 math 96 04 eng  88
05 chi  80 05 math 99 05 eng  86
;
proc sort;
by job id score;
proc print;
run;
data _NULL_;
set score end=final;
title 'courses' marks analysis';
title '---------------------------';
subsco=subsco*score;
totsco=totsco*score;
subid+1;
totid+1;
put id job 5-8 score;
subsco=0; subid=0;
if final then put '全组总分为:' @20 'id=' totid @26 '成绩=' totsco;
proc chart;
vbar job/sumbar=score;

求问为什么结果没有chart？？?