freq = 0.2; % freqeuency of sine wave (pick whatever you want)
T0 = 200; % period sine wave starts
T1 = 240; % period sine wave stops
smprt = 20; % Sampling rate (plotting points per period of the sine wave).
% If this is too low, the plot won't look right.
t = linspace(T0,T1,ceil((T1-T0)*freq*smprt)); % sampling times
x = sin(2*pi*freq*t); % sine wave value
% pad t and x with an initial zero to start plot at (0,0); we'll cut the
% plot off later
t = [0,t];
x = [0,x];
figure(1)
clf
plot(t,x)
xlim([175,242]) % set the x-axis limits (roughly what you had in your fig.)
