Error by using xline function

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Chiara Lanzi 2020-11-7

评论： Star Strider 2021-3-9

Hi everyone,

I ran into a problem by using the xline function.

My aim was to draw a vertical line for x=5 and planned to use the xline function but I got "Undefined function".

I find this strange as the function is on the help suggestions.

Can somebody help me with this issues?

Thankks to all who can help me.

Chiara

Star Strider 2020-11-7

The xline function was introduced in R2018b.

Try this:

figure
plot((0:8), rand(1,9))
hold on
plot([1 1]*5, ylim, '-r')                               % Draw A Red Vertical Line At ‘x=5’
hold off

Is it possible to add text to the line?

Star Strider 2021-3-9

Rasmus Johs Nielsen — Probably. It depends on what you want to do, and where you want to place the text.

See the documentation on text for details.

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