Edit colorbar of heatmap (string)

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Gerrit Liedtke
Gerrit Liedtke 2019-6-26
回答： Tony Castillo 2023-12-19
Hi,
Is it possible to edit the colorbar of a heatmap such that it looks like the following image (rapidly created with paint ;) )
a.PNG
So the values aren't numeric but strings.
Thanks for help!
  1 个评论
Adam Danz
Adam Danz 2019-6-26
编辑：Adam Danz 2019-6-28
The handle to the colorbar in heatmap is inaccessible. Without the handle, you can't change properties to the colorbar; you can't even delete it. Even when you try to add a new colorbar, you cannot output the handle with a heatmap plot.
heatmap() in general is highly restrictive in the user's abilty to manipulate many of its properties. I used to use heatmap more frequently prior to these changes and have moved onto using imagesc() instead. Bummer.

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采纳的回答

Adam Danz
Adam Danz 2019-6-26
编辑：Adam Danz 2019-6-27
This can't be done with heatmap() (see comments under the question).
If you're using a different function that allows access to the colobar, it's fairly straightforward. Here's a demo.
% Create demo
C = rand(3,4)/10;
imagesc(C)
cbh = colorbar();
% set color range
caxis([0,.1])
% set ticks
set(cbh, 'YTick', [0.001, 0.01, 0.05, .1], ...
'YTickLabel', {'p=0.001', 'p=0.01', 'p=0.05', 'p=.1'})

更多回答（2 个）

Christian Karcher
Christian Karcher 2020-4-28
编辑：Christian Karcher 2020-4-28
The handle to the colorbar is accessible, and with it all modifications:
figure;
heatmap(rand(5))
axs = struct(gca); %ignore warning that this should be avoided
cb = axs.Colorbar;
cb.TickLabels = {'p<0.1','p>0.1','...'};
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Alexander Krauss
Alexander Krauss 2022-9-29
编辑：Alexander Krauss 2022-9-29
Great solution, thanks a lot (also for the rapid reply) ! :)
Best regards,
Alex

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Tony Castillo
Tony Castillo 2023-12-19
Is it possible to add a label to that colour bar which is directly created in a heatmap? I mean we can tag a SURF plot (the colourbar because it is separated from the surfplot), but I have not found the manner of doing the same in the colorbar of the heatmap.

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