Creating a stacked bar plot with a non-unique x-axis.

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Im working with fear data where the subject will freeze for a specific amount of time. This time varies and the location on the track where this happens also varries. I have 2 arrays, one with the location and one with the length of the fear. I wanted to plot this 'stacked' in a barplot so you can easily see the amount of occurances and the total time someone was frozen at a specific location. However, when i try to do this i get the following error: "XData values must be unique."
Is there a way for me to fix this?
Some example data: (as you can see freezes can happen on the same x location, in this example (and my own data) the 1st x value corresponds with the 1st y value).
x = [2, 3, 6, 9, 2, 6, 2, 5, 4];
y = [4, 2, 3, 1, 3, 2, 5, 2, 5];
bar(x, y, 'stacked')

Accepted Answer

Voss on 28 Jul 2022
Does this work?
x = [2, 3, 6, 9, 2, 6, 2, 5, 4];
y = [4, 2, 3, 1, 3, 2, 5, 2, 5];
xx = min(x):max(x);
nxx = numel(xx);
counts = histcounts(x,nxx);
yy = NaN(max(counts),nxx);
for ii = 1:nxx
yy(1:counts(ii),ii) = y(x == xx(ii));
bar(xx, yy, 'stacked')
Martijn Heemskerk
Martijn Heemskerk on 29 Jul 2022
Edited: Martijn Heemskerk on 29 Jul 2022
Nevermind, i found the anomaly! My code was doing something weird, not yours. Thank you for your help!

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