How do I use the command 'smooth' to smooth a plot of data I have pulled from two matrices?

Here is the code I used:

 if true
cloudy = find(Tday > 312.38 & Tday < 312.91);
T1smooth = smooth(Tmatrix(cloudy),'lowess');
figure(3),plot(Tday,T1smooth)
  end

Answer 1

[OCDER]

Assuming Tmatrix is a 1xN or Mx1 matrix, your use of smooth is correct. But note that you are doing smoothing ONLY on cloudy days, and not all days. The other way to do this is smooth Tmatrix, and then take the cloudy days. You'll probably get different results, but which is the correct order depends on the application.

plot(Tday(cloudy), T1smooth)