plot 3 horizontal lines

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Chris
Chris am 23 Aug. 2011
Bearbeitet: John D'Errico am 12 Jul. 2023
I have a simple x,y plot of values. I want to plot 3 additional horizontal lines, one being the mean, one being 2 standard deviations above, and one being 2 standard deviations below. I figured out how to plot the mean but I can't figure out how to plot the standard deviations on the same plot.

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Vishnu
Vishnu am 12 Jul. 2023
Hey @Chris!
I see that you want to create a plot with horizontal lines representing values above and below the mean by 2 standard deviations. Here is an example oh how we can achieve this:
A = [4 5 1];
t = [1 2 3];
plot(t,A)
hold on
avg = mean(A);
deviation = std(A);
yline(avg,"g")
yline(avg+2*deviation,"r")
yline(avg-2*deviation,"b")
hold off
Note the hold on and hold off is used to keep plotting onto the same plot. for further reading you can check out the following documentations:
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John D'Errico
John D'Errico am 12 Jul. 2023
Bearbeitet: John D'Errico am 12 Jul. 2023
I accepted this accurate answer, since the question was an old one and might not get seens by the OP.

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