How to patch upperbound and lowerbound

I read about patch to fill in the confidence interval

https://www.mathworks.com/matlabcentral/answers/422522-patch-or-fill-between-upper-and-lower-bounds

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?

[alpedhuez]

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?

Answer 1

[Star Strider]

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.

.

[alpedhuez]

use of flipud is the key. Thank you.

[Star Strider]

As always, my pleasure!

.