Matrix calculation + loop

Question

Florent Rouxelin 2017-6-29

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/346815-matrix-calculation-loop

编辑： Walter Roberson 2017-6-29

在 MATLAB Online 中打开

Does anyone knows to program the following in Matlab?

B0 [4x4]

I [4x4]

sigma [4x4]

Here is what I have so far, but this is wrong:

I = ones(4);
sigma_sum=V;
for t = 1:(T-1)
      block=I; 
      for i = 1:t
          block = (block + B0.^i)*V*(block + B0.^i)';
      end
      sigma_sum = sigma_sum + block;
  end

Thanks for your help!

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Answer 1

James Tursa 2017-6-29

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https://ww2.mathworks.cn/matlabcentral/answers/346815-matrix-calculation-loop#answer_272407

在 MATLAB Online 中打开

Maybe this is what you want:

B0 = whatever
V = whatever
sigma_sum = V;
M = eye(4);  % <-- I am guessing that you really need eye(4) here instead of ones(4)
for t=1:(T-1)
    M = M + B0^t;  % <-- Used ^t instead of .^t here ... again I am guessing a bit here
    sigma_sum = sigma_sum + M*V*M';
end