Draw a line on a 2D plot at a particular x and y values

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Orion 2014-6-2

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/132043-draw-a-line-on-a-2d-plot-at-a-particular-x-and-y-values

编辑： Pulkit Rustagi 2020-9-25

采纳的回答： George Papazafeiropoulos

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I'd like to draw a line at a particular x (and corresponding y) value for a plot that looks like this:

x=linspace(0,4)
y=x.^2
plot(x,y)

If I use the data cursor, it doesn't let me place it on a particular value (in my case where x=3), so I'd like it to do that and show me the x and corresponding y coordinates somewhere on the graph. Ideally, I'd like to have a dashed line protruding from the x and y axes to this point on the graph.

Any help would be appreciated.

Thanks

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采纳的回答

George Papazafeiropoulos 2014-6-2

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/132043-draw-a-line-on-a-2d-plot-at-a-particular-x-and-y-values#answer_139092

在 MATLAB Online 中打开

x=linspace(0,4);
y=x.^2;
plot(x,y);
line([3;3],[0;9],'linestyle','--');
line([0;3],[9;9],'linestyle','--');

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ARVIND KUMAR SINGH 2020-7-6

x=linspace(0,4);

y=x.^2;

plot(x,y);

line([3;3],[0;9],'linestyle','--','Color','red');

line([0;3],[9;9],'linestyle','--','Color','green');

Pulkit Rustagi 2020-9-25

编辑：Pulkit Rustagi 2020-9-25

Is it possible to label the said dashed line? is there a label field for line function?

Its not specificly mentioned in the documentation

https://www.mathworks.com/help/matlab/ref/line.html

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