horizaontal lines in plots in a defined date

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Patricia Alejandra Palacios Romero 2018-7-4

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回答： Rik 2018-7-6

I have a time series with dates and outflow measurements. On one hand, I have to plot them, that's not the problem; on the other hand, I need to add to that plot 2 vertical lines to indicate a range of time. I use the datetime function to put together input numbers for example datetime(2016,02,25), that represent the 2 dates for the horizontal lines.

Is there a way I can do that.?

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Rik 2018-7-4

In general you can plot extra lines with hold on. Tip: use ylim to figure out the extent you need to plot the lines.

Patricia Alejandra Palacios Romero 2018-7-5

I already tried it but it doesn't seem to work, is there another way?

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Answer 1

Rik 2018-7-6

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https://ww2.mathworks.cn/matlabcentral/answers/408836-horizaontal-lines-in-plots-in-a-defined-date#answer_327737

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The code below should work for you. If it does not, please paste all red error text in a comment.

t_special=[datetime(2016,02,25) datetime(2016,03,25)];
t=datetime(2016,01,01):datetime(2016,05,01);
y=sin((1:numel(t))/10)+rand(1,numel(t))/15;
figure(1),clf(1)
plot(t,y)
hold on
y_lims=ylim;
for n=1:numel(t_special)
    plot([t_special(n) t_special(n)],y_lims,'k')
end
hold off