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.![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/526089/image.png)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/526089/image.png)
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Adam Danz
2021-2-20
编辑:Adam Danz
2021-2-20
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
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Adam Danz
2021-2-20
编辑:Adam Danz
2021-2-20
> In your demo of "method #2", X1 and Y1 must be of same size
Correct. In any demo that would be the case. (x,y) coordinates come in pairs so they must have the same number of elements.
> My X1 is a scalar and it is single whereas Y1 is of length 282
Unless I've misunderstood your question, I think you have this reversed. The horizontal line is defined by at least two x values (the end points) and 1 unique y-value which is repeated for each x value.
The horizontal line in your plot might be something like X1=[1, 280]; Y1 =[15, 15];
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