How to compute the percentage of difference between two plots?

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Priya
Priya on 30 Jan 2014
Commented: Image Analyst on 12 Sep 2018
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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Accepted Answer

Image Analyst
Image Analyst on 30 Jan 2014
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
metehan yayla on 12 Sep 2018
What if the "referenceSignal" is zero at some element(s)? Then, percentageDifference will be infinity which results in infinite meanPctDiff.

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More Answers (1)

Daniel Simmons
Daniel Simmons on 25 Feb 2015
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>

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