How to find the difference between two graphs?

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Agastya
Agastya 2014-11-24
评论： Saraswatula Sai Pavan Sastry Sastry SOME 2018-9-23
I have a graph shown in the figure below and now i have to find difference between two graphs, red line is drawn from some A= 59x2 matrix(taken from matlab Simulink) and blue line drawn from B= 149x2 matrix both drawn for same parameters and i don't have any idea how to find the difference between both the lines. So if anyone has any idea please help me with that.
code used is
figure();plot(simout.A.Time,simout.A.Data);
hold on;
plot(B(:,1),B(:,2));
Thanks in advance Agastya

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the cyclist
the cyclist 2014-11-24
The curves are pretty smooth, so you could use the interp1 command to create y values at common x points for the two curves, and then take the differences of those y values.
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Saraswatula Sai Pavan Sastry Sastry SOME
Saraswatula Sai Pavan Sastry Sastry SOME 2018-9-23
Hello the cyclist, what if the x values aren't common?Then how to find the difference?

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Ahmet Cecen
Ahmet Cecen 2014-11-24
One way is to interpolate the 59x2 matrix to be 149x2. Check spectral interpolation using Fourier transforms. You might even be able to get away with imresize in your case.

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