matlab for循环后结果与循环前一致

Question

 d=30;
N=10;
sintheta=linspace(-0.05,0.05,1001);
delta=pi*d*sintheta/0.5;
pbs=sin(delta);
I=zeros(size(delta));
for i=1:1001
if pbs(i)~=0
I(i)=N^(-2)*(sin(N*delta(i))./sin(delta(i))).^2;
else
I(i)=1;
end

运行后
I=zeros(size(delta))
相当于没有进行for循环，猜想是条件表述有问题，但不知该如何修改

Answer 1

你好，你的循环变量i应该作为下标放在delta里面变成delta(i)，给你修改如下：

d=30;
N=10;
sintheta=linspace(-0.05,0.05,1001);
delta=pi*d*sintheta/0.5;
pbs=sin(delta);
I=zeros(size(delta));
for i=1:1001
    if pbs(i)~=0
        I(i)=N^(-2)*(sin(N*delta(i))./sin(delta(i))).^2; %这里修改成delta(i)就行啦
    else
        I(i)=1;
    end
end

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