a=-pi/4:pi/999:pi/4;
n=2:2:1000;
y1=0.3/sum((cos(n.*(pi/9))./((n.^2-1).^2))).*sum(cos(n.*(pi/9)).*cos(n.*a)./((n.^2-1).^2));
plot(a,y1);
这个求出来y1只有一个结果,图像是空的,是缺了循环吗?

 Accepted Answer

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a=-pi/4:pi/999:pi/4;
n=2:2:1000;
for ii = 1:length(a)
y1(ii)=0.3/sum((cos(n.*(pi/9))./((n.^2-1).^2))).*sum(cos(n.*(pi/9)).*cos(n.*a(ii))./((n.^2-1).^2));
end
plot(a,y1);

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