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I'm new to Matlab, I wanna draw a simple line x=4, or y=9. Someone kindly help me?

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Matt Fig
Matt Fig 2011-6-5

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line([4 4],[0 10],'color','b') % Blue line from (4,0) to (4,10)
line([0 10],[9 9],'color','r') % Red line from (0,9) to (10,9)
axis([0 10 0 10]) % Set the axis limits
You can do the same thing with the PLOT command.

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Vibol TEAV
Vibol TEAV 2011-6-5
Great, this is what I'm looking for. Thanks a million!!!

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Steven Lord
Steven Lord 2022-11-7

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If you're using release R2018b or later you can use the xline or yline functions.

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