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

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HelpAStudent
HelpAStudent 2021-10-11
回答： KSSV 2021-10-11
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.

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KSSV
KSSV 2021-10-11
Ran in:
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

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