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How to patch upperbound and lowerbound

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alpedhuez
alpedhuez on 23 Aug 2021
Commented: Star Strider on 23 Aug 2021
I read about patch to fill in the confidence interval
But I am not yet sure of how it works. (Partly due to the fact that https://www.mathworks.com/help/matlab/ref/patch.html only has graphic examples.)
Suppose I have
plot(T.date,upperbound)
hold on
plot(T.date,lowerbound)
Then how can one fill in upperbound and lowerbound?
  1 Comment
alpedhuez
alpedhuez on 23 Aug 2021
I have tried https://www.mathworks.com/matlabcentral/answers/180829-shade-area-between-graphs but does not seem to work. Maybe it is because x axis is a datetimie variable?

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Accepted Answer

Star Strider
Star Strider on 23 Aug 2021
Try something like this —
T = table(datetime('now')+days(1:14).', rand(14,1), rand (14,1)+1, 'VariableNames',{'date','lowerbound','upperbound'})
T = 14×3 table
date lowerbound upperbound ____________________ __________ __________ 24-Aug-2021 15:54:18 0.3007 1.7723 25-Aug-2021 15:54:18 0.68026 1.703 26-Aug-2021 15:54:18 0.4398 1.6127 27-Aug-2021 15:54:18 0.62549 1.237 28-Aug-2021 15:54:18 0.44381 1.6517 29-Aug-2021 15:54:18 0.71737 1.3115 30-Aug-2021 15:54:18 0.41553 1.1505 31-Aug-2021 15:54:18 0.56936 1.405 01-Sep-2021 15:54:18 0.064302 1.329 02-Sep-2021 15:54:18 0.85725 1.5955 03-Sep-2021 15:54:18 0.15449 1.7525 04-Sep-2021 15:54:18 0.91195 1.8573 05-Sep-2021 15:54:18 0.10671 1.4731 06-Sep-2021 15:54:18 0.41436 1.6558
figure
patch([T.date; flipud(T.date)], [T.lowerbound; flipud(T.upperbound)], 'r', 'FaceAlpha',0.5)
grid
The patch function until recently did not work with datetime arrays, so it was necessary to use fill instead, with the same syntax as demonstrated here.
.

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