Take values from array within nested loop

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Smita Banerjee
Smita Banerjee 2016-6-30
回答： dpb 2016-6-30
Want to implement
RMSE= sqrt{1/K* summation k=1:K [(theta_est-theta_true)]^2}
theta_est and theta_true may be of different length
error=0;
for k=1:K
for m=1:length(theta_est)
for t=1:length(theta_true)
error=error+(theta_est(m,k)-theta_true(t,k)).^2
RMSE=sqrt(1/K*error)
end
end
end

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回答（1 个）

dpb
dpb 2016-6-30
"Implement RMSE= sqrt{1/K* summation k=1:K [(theta_est-theta_true)]^2} [where] theta_est and theta_true may be of different length"
Well, there's no definition of a difference where there aren't comparable entities so your choice is either compute over the min(length(theta_est),length(theta_true)) or, if the two vectors represent a given time of commensurate duration, interpolate the shorter or decimate the longer to match. The first option is simply
K=min(length(theta_est),length(theta_true));
RMSE=rms(theta_est(1:K)-theta_true(1:K)); % rms from Signal Processing Toolbox

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