# How can I find a multiplication coefficient between two signal?

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Lara on 31 Mar 2023
Commented: Lara on 31 Mar 2023
Hello!! I have two signals measured experimentally. Theoritically, the second signal can be obtained with the first one by multiplying it with a constant ( this constant characterize my system). How can I find on matlab this constant. I tried "corr" but it doesn't work. Thank you so much for your help!!!

John D'Errico on 31 Mar 2023
Edited: John D'Errico on 31 Mar 2023
Your need is to solve the problem
signal2 = constant*signal1
Where the variable "constant" is unknown. This is easy to solve in MATLAB.
constant = signal1(:)\signal2(:);
Lara on 31 Mar 2023
Actually, the two signals are mesured experimentally and have noise and incertitude, that's why i can't do a simple ratio. But I did the root mean square error and it works.

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