How to draw a vertical line with a given height?

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?

Answer 1

[CS Researcher]

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]);