Find where the vertical line intersects the y values

I have attached the plot I generated for a data set. I would like to find the points where the vertical lines intersect the y-values. Further, is there a way to just plot a point (or a marker) instead of the vertical lines? I am just plotting a time stamp using the vertical line.

Answer 1

[Star Strider]

You obviously have the x values, so I would use the interp1 function to find the y values in your data.

[Dushyant Dhundara]

I tried but it gives NaN as the output. FYI, the vertical lines and the y values are not dependent on each other

[Star Strider]

The vertical lines from your known desired ‘x’ do not have to be dependent on existing ‘y’ values. That is the idea behind interpolation.

I do not have your data or vector of ‘x’ values representing the vertical lines, so I cannot write code precisely for it. If you are getting NaN results, you may need to ask interp1 to extrapolate. For example:

xi = ...;                                       % Vector Of ‘x’ Values To Interpolate
yi = interp1(x, y, xi, 'linear', 'extrap');     % Produces Vector Of ‘yi’ Values Matching ‘xi’

You must specify a method (here 'linear') and that you want interp1 to extrapolate (so add the 'extrap' argument).

[Dushyant Dhundara]

Thank you so much, it is what I was intending to do. I used linear before but the remaining parameter did the trick.

[Star Strider]

My pleasure.

If my Answer solved your problem, please Accept it!