How to add a dashed horizontal line at 0 using plot function?

How I do add a dashed horizontal line on a graph using the plot function?

Answer 1

[Adam Danz]

Here are 3 options to add a dashed horizontal line to a plot. The 1st option is recommended if you're using matlab r2018b or later.

% Use yline() to plot a horizontal line at y=0 (requires r2018b or later)
% https://www.mathworks.com/help/matlab/ref/yline.html
% This will automatically adjust if your xlim changes.
yline(0,'k--')

% Plot a line at y=0 that spans from x=0 to x=5
plot([0,5],[0,0], 'k--')

% Plot a line at y=0 that spans the current x-limits of your axes
plot([min(xlim()),max(xlim())],[0,0], 'k--')

[shahriar sowad]

@Adam Danz i wanted to plot a line at y=0.2

so i wrote plot([0,8000],[0.2 ,0.2])

but it is giving me a line at y=0;what should i change in the code?

[Adam Danz]

If you zoom into the line you will see that it is plotted at y=0.2.

[shahriar sowad]

yes,got it,thanks