can you please explain in words how does the loop works. Note the code is in Matlab language.

%% code reset

% close all figures

close all

% clearing the work space

clear

% clearing command window

clc

%% frequency

freq = [10, 15, 20, 40, 60, 300];

%% plot

tiledlayout(3,2);

for i = 1:length(freq)

fs = freq(i);

ts = 1/fs; % sampling period

t_s = 0:ts:10-ts; % values of the time vector (x-axis)

x_s = 2+6*cos(2*pi*10*t_s)+cos(2*pi*20*t_s); % Original signal (analog)

nexttile;

plot(t_s, x_s);

title(['fs = ', num2str(fs),' Hz']);

axis([0 0.5 -4 10]);

xlabel('time (s)');

ylabel('x(t)');

end

%% stem

for i = 1:length(freq)

fs = freq(i);

ts = 1/fs;

t_s = 0:ts:10-ts;

x_s = 2+6*cos(2*pi*10*t_s)+cos(2*pi*20*t_s);

nexttile;

stem(t_s, x_s);

title(['fs = ', num2str(fs),' Hz']);

axis([0 0.5 -5 11]);

xlabel('Samples (n)');

ylabel('x(n)');

end

%% power spectrum plot (pwelch)

tiledlayout(3,2)

for i = 1:length(freq)

fs = freq(i);

ts = 1/fs;

t_s = 0:ts:10-ts;

x_s = 2+6*cos(2*pi*10*t_s)+cos(2*pi*20*t_s);

nexttile;

pwelch(x_s, [], [], [], fs)

title(['fs = ', num2str(fs),' Hz']);

end