How to obtain the sum of series of a discrete-time signal?

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I want to obtain the value for the below function in Matlab.
fs = 5000; %sampling frequency
N=250; %number of samples for 50ms time portion
ts=1/fs; %time interval between samples
t = linspace(0,0.05,N);
x = sin(2*pi*100*t)+0.7*cos(2*pi*500*t);
The x[n] is given above. y[n] is the denoised case of the white gaussian noise added x[n] signal.
I'have tried
F1=symsum((x(n)-y(n))^2/x(n)^2,n,0,N-1);
but it didn't work.
How can I define the x in terms of n?

Answers (1)

Hiro Yoshino
Hiro Yoshino on 25 May 2021
Do you intend to use Symbolic Math Toolbox?
In that case, you need to define your variables as follows:
syms x y n
before beginning to code that way.

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