How do I smooth this plot?

I am trying to smooth this plot in order to look like the the second attached plot. Can anyone guide me through to do so? Thank you very much in advance. { [data,T,vT]=xlsread('Yellow_Stress vs Time.xlsx')

Time = data(:,1) Stress = data(:,4)

title('Stress Relaxation Response Yellow Sample') xlabel('Time (sec)') ylabel('Stress (Pa)')

plot(Time, Stress) }

Which should look like this:

Answer 1

[Image Analyst]

Have you simply tried conv?

windowWidth = 51; % Make a higher odd number for more smoothing.
kernel = ones(1, windowWidth)/windowWidth;
smoothedStress = conv(Stress, kernel, 'same');