How do i plot a line at a single desired point on the X-Axis?

I have a data i.e. x=[1:10]; y=[23 24 29 45 32 23 67 45 89 31]; and i want to draw a line on the x-axis at point 6 of x-axis. How can i do that? Thanks, Parth

[Walter Roberson]

Where should the line start? Where should it end? Is it a horizontal line or a vertical line?

Answer 1

[Kuifeng]

 %at point x0 = 6, vertical line
x0 = 6;
plot([x0 x0], [min(y), max(y)], 'r-'); 
%revise the y values to your desired values