Colorbar in colormap with labels

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erup eruo
erup eruo on 26 Oct 2018
Answered: erup eruo on 26 Oct 2018
Hello,
I have this simple example where the colorbar is not working properly. For example, the color corresponding to 'j' is not shown wether the color coreesponding to 'h' (not present in the representing matrix) is.
labels = {'a','b','c','d','e','f','g','h','i','j','k','l'};
mtx = [2 5 4 5 6 3 2 5 2 2 2 4 6 7 9 10 9 5 9 7 10 2 3];
t = (0:1:length(mtx)-1)/5;
y = ones(1,length(t));
[C,ia,ic] = unique(mtx);
figure
colormap(jet(length(C)));
image(t,y,mtx); % or imagesc instead
yticklabels({});
colorbar('XTick',0:1:12,'TickLabels',labels,'Position',[0.95 0.1 0.01 0.5]);
Can anyone help me??
Tanks!!

Accepted Answer

jonas
jonas on 26 Oct 2018
Edited: jonas on 26 Oct 2018
There range in your plotted values are 2-10, and the colorscale is per default scaled so that the maximum (10) and minimum (2) are the max and min values on your colormap. You need to force the colorbar to extend beyond these values.
labels = {'a','b','c','d','e','f','g','h','i','j','k','l'};
mtx = [2 5 4 5 6 3 2 5 2 2 2 4 6 7 9 10 9 5 9 7 10 2 3];
t = (0:1:length(mtx)-1)/5;
y = ones(1,length(t));
set(gca,'clim',[0 12])
figure
cmap=colormap(jet(numel(labels)));
image(t,y,mtx); % or imagesc instead
yticklabels({});
cb=colorbar('XTick',1.5:1:12.5,'TickLabels',labels,'Position',[0.95 0.1 0.01 0.5],'limits',[1 13]);

More Answers (3)

erup eruo
erup eruo on 26 Oct 2018
That's right. But there is neither 12 nor 8 nor 11. With these limits, the labels don't correspond with the colors. Even though, 9 has the same colour than 10.
  2 Comments
jonas
jonas on 26 Oct 2018
Come on.. don't accept your own "answer" that isn't even an answer.

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erup eruo
erup eruo on 26 Oct 2018
Okey
thanks for your info
labels = {'a','b','c','d','e','f','g','h','i','j','k','l'};
mtx = [2 5 4 5 6 3 2 5 2 8 2 2 4 6 7 9 10 9 5 9 7 10 2 3 11 12];
t = (0:1:length(mtx)-1)/5;
y = ones(1,length(t));
figure
colormap(jet(numel(labels)));
image(t,y,mtx); yticklabels({});
colorbar('XTick',1.5:1:12.5,'TickLabels',labels,'Position',[0.95 0.1 0.01 0.5],'limits',[1 13]);
set(gca,'clim',[1 12]);
Fyi, this is how I wanted the final result.
THANK YOU VERY MUCH!!
  2 Comments
Image Analyst
Image Analyst on 26 Oct 2018
Vote for it too, like I did.
People who help you can earn "reputation" points when people Accept their answers (4 points) or vote for them (2 points). You can do both if you were the original poster. See here: https://www.mathworks.com/matlabcentral/answers/help?s_tid=al_priv#reputation

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erup eruo
erup eruo on 26 Oct 2018
I'm sorry. I made a mistake. Obviously your answer is the good one

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