for !i=1 to 133
%a=@str(111*(!i-1)+1)
%b=@str(111*(!i-1)+90)
smpl %a %b
equation eq.ls ser01 c ser02
a(!i)=@coefs(1)
b(!i)=@coefs(2)
next
运行结果却是a没定义，怎么回事，望指点