MATLAB: How to draw a vertical line with a given height

plotplotting

I use

line([1 1]*posx)

to draw a vertical line in a figure. Can I also draw a vertical line with a specific height?

For a line from (x,y) to (x,y+height), Use this:

line([x x], [y y+height]);

From origin it could just be

line([0 0], [0 height]);

Use the line command.

line([1,1],[0,2],'Color','k')

draws a black line from (1,0) to (1,2), for example.

 plot(t,y)
%the max you can do is
 set(gca,'position',[0 0 1 1])