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

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Anne Nguyen 2019-9-29

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评论： shahriar sowad 2021-7-1

采纳的回答： Adam Danz

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

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采纳的回答

Adam Danz 2019-9-29

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https://ww2.mathworks.cn/matlabcentral/answers/482669-how-to-add-a-dashed-horizontal-line-at-0-using-plot-function#answer_393967

编辑：Adam Danz 2019-10-2

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--')