Subscript indices must either be real positive integers or logicals. How to solve it?

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Auryn_ 2017-12-5

评论： Auryn_ 2017-12-5

Hi, I know this is asked very often, but still I don't know how to solve it in my case. This is the code:

M=4;
n = zeros(1,M);
q=[0:M-1]*(2/M);
for i1=1:M
      for i2=1:M
          n(q)=n(q)+exp(-1i*q*(i1-i2))*A(i1,i2);
      end
end

I received this error message: "Subscript indices must either be real positive integers or logicals.""

Could you please help me?

Cheers!

when you do n(q) q is zero so it gives error

arrays in matlab are accessed with indices starting from 1

also you didn't define A

Auryn_ 2017-12-5

Yes, it's like the Fourier transform directly. I need the points between [0,2\pi).

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