How draw on-off singal in Matlab.

I want to graph this function in Matlab, but I don't know how to code the sigma delta part. Help me.

Answer 1

[Balavignesh]

Hi Soo,

I understand that you want to know how to define "dirac-delta" and "sigma" in MATLAB.

I suggest you to use "dirac" function to define the "dirac-delta" function. Although there is not any specific function to define "sigma" over a infinite range, you can use "sum" function to get a close approximation.

After you declare a range of values for "w", you can then use a for loop and store the values of "Sy(w)" in an array to plot your desired function.

Here is an example code showing how you can do it:

% Initializing with some Trash Values. Input your own data.
w = 0:100 ;
n = -100 : 100;
Tb = 0.6

Tb = 0.6000

Sy = zeros(1,length(w)); % Pre-allocating 'Sy' for faster computation

% Computing values of Sy. This is just a part of computation. 

for i = 1:length(w)
        
    Sy(i) = sum(dirac( w(i) - (2*pi*n)/Tb));
    
end

% Plot Sy against w

Please refer to the following documentation links to know more about:

• 'Dirac function': https://in.mathworks.com/help/symbolic/sym.dirac.html
• 'Sum function': https://in.mathworks.com/help/matlab/ref/sum.html