How to include plot in a function?

Hi everyone, basically this is the coding function (https://uk.mathworks.com/matlabcentral/fileexchange/880-mutual-average-information) that I've used to calculate the Average Mutual Information (AMI) in order to find the time delay. I want to plot time lags against AMI. similar to this picture. The problem now is i don't know how to include plotting coding in my fuction. Hope you guys can teach me yaa. thanks in advance!

[redroses]

I already add some code for plot. but only blank chart is displayed.

%% PLOT
if lag > 1 
  t = 0:lag;
 plot(lag,v)
  xlabel('Time Lag')
  ylabel('AMI')
  title('Average Mutual Information')
end

[Tommy]

What input arguments are you providing when you call this function?

(edit) My guess is the

if lag > 1

is causing issues, because it means that every element within lag needs to be greater than 1 for anything to be plotted. Is that intended?

[redroses]

hi mr tommy. first and foremost thanks for the reply ya. based on this coding https://uk.mathworks.com/matlabcentral/fileexchange/880-mutual-average-information , input for lag is 10 and for x value is like the one that I attached in the microsoft excel here. I've tried to remove if lag>1 like you suggested but only blank chart is displayed...

[Tommy]

If you are inputting a scalar value for lag, you will get a scalar for v. You are then plotting a single point.

To see this point, use

%% PLOT
if lag > 1 
  t = 0:lag;
 plot(lag,v,'o')
  xlabel('Time Lag')
  ylabel('AMI')
  title('Average Mutual Information')
end

I suspect that you should be using a vector for lag.