how to compare the characteristics of two graphs

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.

Answer 1

[Massimo Zanetti]

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?

[Princy Manaswini]

this helped me to see the similarities between two graphs more precisely but the question is how the matlab can give me a result like "yes,the two graphs/actions are the same or different" based on the characteristics but not the values involved in the graph.

[Massimo Zanetti]

What do you precisely mean by "characteristics"?

[Princy Manaswini]

shape of the envelope exactly..the peaks,rise and fall of the graphs.

[Massimo Zanetti]

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]

that's working..!!but now i want to do it using neural network pattern recognition tool.

Answer 2

[Greg Heath]

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