How to compute the percentage of difference between two plots?

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Priya 2014-1-30

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https://ww2.mathworks.cn/matlabcentral/answers/114260-how-to-compute-the-percentage-of-difference-between-two-plots

评论： Image Analyst 2018-9-12

Hi, Could anyone please tell me how to calcute the percentage of difference between two plots? Actually I'm trying to see if there is any model error between two plots or in other words, how much they deviate from each other.

I have come across some functions like rms, R-square fit etc. But I don't have any idea on using them. Please help me with this.

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Image Analyst 2014-1-30

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在 MATLAB Online 中打开

What's wrong with the obvious:

deltaSignal = abs(testSignal - referenceSignal);
percentageDifference = deltaSignal ./ referenceSignal; % Percent by element.
meanPctDiff = mean(percentageDifference); % Average percentage over all elements.

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metehan yayla 2018-9-12

What if the "referenceSignal" is zero at some element(s)? Then, percentageDifference will be infinity which results in infinite meanPctDiff.

Image Analyst 2018-9-12

Correct.

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更多回答（1 个）

Daniel Simmons 2015-2-25

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https://ww2.mathworks.cn/matlabcentral/answers/114260-how-to-compute-the-percentage-of-difference-between-two-plots#answer_169277

To get the error between the 2 plots, you can use the compare the raw data using the relError function found at <http://uk.mathworks.com/matlabcentral/fileexchange/47834-relerror-m>