【答案】应助回帖

5楼: Originally posted by jyd3611 at 2013-04-07 14:51:53
如果只加或只减，画出的图有一部分在x轴下面 我希望图形都在x轴上方...

10楼: Originally posted by 月只蓝 at 2013-04-07 16:38:52
如附图2那样么？
function paint
N=2;
k=-20:5:20;
%K为整数
c=abs((N*sin(pi/N))./(pi*(1+-k*N)));
stem(k,c,'+'),

附图2.jpg
...