how to compare the characteristics of two graphs

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Princy Manaswini
Princy Manaswini 2016-9-27
回答： Greg Heath 2016-9-28
I want to get a result by comparing the characteristics(patterns) of the two graphs above from Matlab. From the above graph we can see that the two graphs are of same characteristics but how to get the same result using Matlab? I have tried it using pattern recognition tool but didn't get any relevant results.please suggest me any other method/toolbox.

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Massimo Zanetti
Massimo Zanetti 2016-9-27
As far as I can get, the two graphs have the same derivative. Try differenziate both of them, you will get similar results. Use diff(x) and diff(y), where x,y are your two signals. Does it help?
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Massimo Zanetti
Massimo Zanetti 2016-9-27
What about measuring the difference of the derivatives, if they are under a given small tolerance then the two graphs are considered to be "similar", otherwise they don't.
a=diff(x);
b=diff(y);
dist=norm(a-b);
tol=0.1;
if dist<tol
disp('graphs have similar charact.');
else
disp('graphs have differente charact.');
end
Tune the TOL parameter to your needs.
Princy Manaswini
Princy Manaswini 2016-9-27
that's working..!!but now i want to do it using neural network pattern recognition tool.

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Greg Heath
Greg Heath 2016-9-28
After looking at the graphs, I would
1. Compare means
2. Compare variances and standard deviations.
3. Compare standardized waveforms (zscore or mapstd)
4. Calculate the Mahalanobis distance between them.
Hope this helps.
Greg

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