Hi Jack,
Kindly refer to the following example in which I am Adding the transparency by setting the "FaceAlpha" property to a value between 0 (completely transparent) and 1 (completely opaque) to the stem plot.
figure
data = [2 4 6 7 8 7 5 2]; %input data
stem(data) %creating stem plot of data
dim2 = [.74 .56 .1 .1]; %specifying the dimensions and position of the rectangle
annotation('rectangle',dim2,'FaceColor','blue','FaceAlpha',.2)
For more information regarding adding the transparency using stem function, kindly refer to the following documentation:
I hope this answer helps you.
