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

25 views (last 30 days)
Orion on 2 Jun 2014
Edited: Pulkit Rustagi on 25 Sep 2020
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

George Papazafeiropoulos on 2 Jun 2014
x=linspace(0,4);
y=x.^2;
plot(x,y);
line([3;3],[0;9],'linestyle','--');
line([0;3],[9;9],'linestyle','--');
ARVIND KUMAR SINGH on 6 Jul 2020
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 on 25 Sep 2020
Edited: Pulkit Rustagi on 25 Sep 2020
Is it possible to label the said dashed line? is there a label field for line function?
Its not specificly mentioned in the documentation

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