How to draw a vertical line with a given height?

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Lilllly
Lilllly 2016-5-4
回答： CS Researcher 2016-5-4
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?

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CS Researcher
CS Researcher 2016-5-4
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]);

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