move x axis labels on a heatmap to the top

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HW on 24 Jan 2018
Commented: Walter Roberson on 9 Nov 2023
Is it possible to move the x axis label on a heatmap (the heatmap function introduced in version R2017a) to the top of the heatmap? I have tried the following:
ax = gca;
ax.XAxisLocation = 'top';
but in response the error message is "Unrecognized property 'XAxisLocation' for class 'matlab.graphics.chart.HeatmapChart'."

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Accepted Answer

Walter Roberson
Walter Roberson on 24 Jan 2018
You can cheat.
axp = struct(ax); %you will get a warning
axp.Axes.XAxisLocation = 'top';
The Axes property is not normally visible, but you can get to it with struct()
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More Answers (1)

Benjamin Kraus
Benjamin Kraus on 8 Nov 2023
Ran in:
If you want to do this using documented approaches, you can use a tiledlayout to position an axes below the heatmap, and the manipulate the tick labels on that axes instead.
t = tiledlayout(1,1);
ax = axes(t);
% Create the heatmap. Specifying the OuterPosition tells the heatmap not to
% replace/delete the axes, but the position of the heatmap will be driven
% by the tiledlayout, so the actual value of OuterPosition doesn't matter.
x = ["Jan","Feb","Mar","Apr","May","Jun"];
y = ["Jul","Aug","Sep","Oct","Nov","Dec"];
h = heatmap(t, x, y, magic(6), 'OuterPosition', [0 0 1 1]);
% Create a categorical vector with the same elements as the heatmap's tick
% labels:
cx = categorical(x, x);
cy = categorical(y, y);
% Plot categorical data into the axes.
plot(ax, cx, cy)
% Change the YDir of the axes to match the heatmap.
ax.YDir = 'reverse';
% Move the XAxisLocation
ax.XAxisLocation = 'top';
% Turn off the y-tick labels on the axes.
yticklabels(ax,[]);
% Optionally, turn off the x-tick labels on the heatmap.
h.XDisplayLabels = repmat("", size(h.XDisplayLabels));

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