find intersection points of a line and a curve.

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I am attaching here the plot. I want to get the intersection points of the horizontal red line with the curve. Also, I want to draw the vertical lines from these intersection points. How both of these tasks can be done? In case, question is not clear feel free to comment.

Accepted Answer

Adam Danz
Adam Danz on 20 Feb 2021
Edited: Adam Danz on 20 Feb 2021
There are several ways to get the x values at each intersection of the y-value. The simplest solution is to use the intersections() function from the file exchange (I show a similar demo in this answer, "method #2").
That function will return the (x,y) coordinates of the intersection points. Use the x values to plot vertical lines using xline().
% x is a vector of x-values at each intersection
arrayfun(@xline,x)
Or, if you're more comfortable with for-loops,
for i = 1:numel(x)
xline(x(i))
end
  3 Comments
NAVNEET NAYAN
NAVNEET NAYAN on 20 Feb 2021
Yes you are correct. I had reversed. Thank you for solving the query and explaining it too.

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