Draw a line

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

Answer 1

[Matt Fig]

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.

[Vibol TEAV]

Great, this is what I'm looking for. Thanks a million!!!

Answer 2

[Steven Lord]

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