How to draw a line from the variable y-axis

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Martin Olafsen 2017-11-6

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https://ww2.mathworks.cn/matlabcentral/answers/365297-how-to-draw-a-line-from-the-variable-y-axis

评论： Martin Olafsen 2017-11-6

Hi

I am making a 2D plot. The x-axis is located at y = 0, but I do not know the position of the y-axis, it depends on the results. Is there a way to find the x position of the y-axis? (I do not want a fixed location of the y-axis, as it should depend on the results.)

Regards

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KSSV 2017-11-6

YOu should have both (X,y_ in hand t plot. Or you have to plot w.r.t indices. YOur question is not clear.

Martin Olafsen 2017-11-6

编辑：Martin Olafsen 2017-11-6

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Ok. I'm trying to make a line from the x-axis to my chosen result point, and a line from the y-axis to the result. For a line from the x-axis I did this:

plot([resultX resultX], [0 resultY])

For a line from the y-axis I would do something of the nature to:

plot(["(y-axis location on x-axis)" resultX],[resultY resultY])

I do not know what to use for y-axis location on x-axis, as the location varies. I don't quite understand what information is missing, hopefully this clears it up.

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