# I have bunch of signals.and I have another signal that is one of mentioned signals but with shifted and different magnitude. How can I find out which signal shifted signal with different magnitude?

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vahid torabi on 19 Aug 2014
Commented: vahid torabi on 21 Aug 2014
very simple example: my signals are: a=sin^2(x); b=cos^2(x)-2; c=x^3-1; d=x^2-1; and my another signal is f=4*cos^2(x-3);
How can I find out f looks like b ????
thank you very much.
vahid torabi on 19 Aug 2014
I mean which algorithm or method I should utilize. Thank you so much.

Salaheddin Hosseinzadeh on 19 Aug 2014
Edited: Salaheddin Hosseinzadeh on 19 Aug 2014
Hi Vahid,
Use
crosscorr(f,b)
or
crosscor(f,b,numel(b)-1)
read MATLAB documentation about crosscorr and how you've to interpret it's output
If you've an amplitude in the out put of crosscorr that is close to 1 it means f and b are similar, if amps are way below 1 then they ain't similar.
doc crosscor
Fs = 100; % Hz
t = 0:1/Fs:2*pi; %
f = 1; % Hz
x = sin(2*pi*f*t);
y = sin(2*pi*f*t + pi/2); % sine and cosine with frequency of 1
z = t.^2; %
crosscorr(x,y)
figure
crosscorr(x,z)
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vahid torabi on 21 Aug 2014
Thank you so much Mr Hosseinzadeh.But my signals are discrete.I have .mat data.I mean:(timeseries data) my signals have time and magnitude. signal 1 : have time(.mat file) and a value(.mat file) signal 2 :......... signal 3 :.......
How to code in this case????