CODEWITHSUNDEEP
matlabheatmapcolorbar
RoflcoptrException
RoflcoptrException

Reputation: 52229

Use the same colorbar for each heatmap in a subplot

I use the following code in Matlab to create a figure consisting of 3 subplots. Each subplot is a heatmap. Normally, all the values displayed with the heatmap are in the range from 1 to 6. The problem is that sometimes, data for one of the subplots does not contain all the values. This results in different colorbars for the subplots.

clf
set(gcf, 'Color', 'None');
set(gca, 'Color', 'None');
set(gca, 'LooseInset', get(gca, 'TightInset'));

subplot(3,1,1);
heatmap(values1, [], [], [], 'ColorMap', @cool, 'NaNColor', [0 0 0], 'ColorBar', true);

subplot(3,1,2);
heatmap(values2, [], [], [], 'ColorMap', @cool, 'NaNColor', [0 0 0], 'ColorBar', true);

subplot(3,1,3);
heatmap(values3, [], [], [], 'ColorMap', @cool, 'NaNColor', [0 0 0], 'ColorBar', true);

fname = 'path';
saveas(gca, fullfile(fname, filename), 'png');

enter image description here

How can I use the same colobars for all 3 subplots?

Upvotes: 1

Views: 4610

Answers (2)

patrik
patrik

Reputation: 4558

Except for the fantastic link on the other answer, I would like to give you some two ways to modify the colorbar. The range of the colorbar is set in the axes.

function test()
[xx,yy,zz]=peaks();

h_surf = surf(xx,yy,zz);
h_cbar = colorbar();
h_axes = get(h_surf,'Parent');

pause(2);
set(h_axes,'CLim',[0,8]);
pause(2);
set(h_cbar,'Limits',[4,8]);

Setting the property CLim like this is the same as using the function caxis. You can also change the limits on the colorbar to show a special range of the colorbar. These two alternatives should be required and sufficient to customize the range of the colorbar.

I also wish to give you a warning. Do not use the functions gcf and gca. These returns the current figure which might not be the one you think is the current. Human interaction (and maybe other things) can change the current figure (eg by clicking on it). This means that even if the code looks great, the output might not be the expected output. This problem seems to have grown worse after 2014b due to some changes in how the graphics is handled. However, the function gca tends to cause much less problems than gca since it is naturally much more complicated to interactively change the current axes on a figure, than the current figure itself.

Upvotes: 2

Mikhail_Sam
Mikhail_Sam

Reputation: 11218

You can define colorbar options in this way: http://www.mathworks.com/help/matlab/ref/colorbar.html?searchHighlight=colorbar%20plot

by the way you can go different ways: 1. if you can change values1,2,3 you can set '1' or any other minimal limit of colorbar scale. 2. use the way like in this link - you can define this limits by your hands but still will get black rectangles for empty values.

Upvotes: 0

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