Plotting a vertical line using ezplot

2012 9 5
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I have a graph and I would like to add a vertical line say x=1 to the graph. how might I do that? (Perhaps ezplot doesn't work for that?)
thank you!

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Matt Fig
Matt Fig 2012-9-5
编辑：Matt Fig 2012-9-5

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This will put a vertical line in the middle of the axes. Adjust as needed.
LIM = get(gca,{'xlim','ylim'});
L = line(mean(LIM{1})*[1 1],LIM{2});

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