How do I draw a horizontal line at a fixed height on the y axis and print the coordinates of the points I intercept?

Hi, I have a matlab plot with 6 curves (or functions).

My y-axis ranges from 0 to 255.

My x-axis ranges from -20 to 20.

How do I "draw" a horizontal line (for example y = 80) and the points it intercepts, print the coordinates and which function they refer to. The functions are differentiated in the legend by colors and names.

Answer 1

[KSSV]

th = linspace(0,2*pi) ;
x = sin(th) ; 

plot(th,x)
hold on
line([th(1) th(end)],[0.4 0.4])

For finding intersections use: https://in.mathworks.com/matlabcentral/fileexchange/22441-curve-intersections