Colorbar in colormap with labels
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erup eruo
am 26 Okt. 2018
Beantwortet: erup eruo
am 26 Okt. 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!!
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jonas
am 26 Okt. 2018
Bearbeitet: jonas
am 26 Okt. 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]);
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Weitere Antworten (3)
erup eruo
am 26 Okt. 2018
2 Kommentare
jonas
am 26 Okt. 2018
Bearbeitet: jonas
am 26 Okt. 2018
maybe if you change this line
colormap(jet(numel(labels)));
You need the same number of (1) colors in your colormap, (2) ticks on your colorbar and (3) number of labels
In your original script you had 12 ticklabels, 13 ticks and ~8-9 colors in your map. If you have more ticks than ticklabels, then the ticklabels start repeating. If you have less colors than ticklabels, then they will not match in the colorbar.
I guess this is what you might want as end-result
erup eruo
am 26 Okt. 2018
2 Kommentare
Image Analyst
am 26 Okt. 2018
Vote for it too, like I did.
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