Problems with using "fill" function to highlight plot background between dates

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Ameer Fahmi
Ameer Fahmi on 11 Jan 2021
Edited: Ameer Fahmi on 19 Jan 2021
Hello everyone
I have been using "fill" function to shade the periods of financial recessions in a plot of oil return volatility, but the function does not work as I wish, I tried to do the following
%Convert excel dates to matlab dates
t = datetime(t{:,1}, 'InputFormat', 'yyyy-MM-dd');
%Specify the dates of the areas to be highlighted:
x1 = datetime(2008,6,01);
x2 = datetime(2009,6,1);
x3 = datetime(2014,6,01);
x4 = datetime(2016,6,02);
x5 = datetime(2020,1,01);
x6 = datetime(2020,7,02);
%Generate y-values for the shaded areas
y1 = [0 1.2 1.2 0];
%Create figure with the shaded areas.
%ax = axes;
fill([x1 x1 x2 x2],y1,'b', 'FaceColor',[0.800000011920929 0.800000011920929 0.800000011920929],'EdgeColor','none');
hold on;
fill([x3 x3 x4 x4],y1,'b', 'FaceColor',[0.800000011920929 0.800000011920929 0.800000011920929],'EdgeColor','none');
hold on;
fill([x5 x5 x6 x6],y1,'b', 'FaceColor',[0.800000011920929 0.800000011920929 0.800000011920929],'EdgeColor','none');
%Plot the curve lines over the highlighted areas.
plot(t,OILSV); % t is time and OILSV is volatility of oil returns
The problem is that the y values for the shaded areas must be specifcified in advance, but I want it to be automatically set up according to may data without any prior specifications, How can I do that? Is there other functions that work better than "fill" function for this purpose specifically?
Ameer Fahmi
Ameer Fahmi on 19 Jan 2021
I just tried the solution you suggested with the data I have, and it works a way better than the previous code, thanks for your help

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