Highlight cells in heatmap
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Ilyass Boukhari
el 26 de Nov. de 2020
Comentada: Ilyass Boukhari
el 1 de Dic. de 2020
I created a heatmap where each cell represents a temperature value using the commands:
cdata = [values of temperature]
xvalues = [0,1,2,3,etc.]
yvalues = [0,1,2,3,etc.]
h = heatmap(xvalues,yvalues,cdata)
I need to:
- command to highlight cells over a limit (for example 500)
- Highlight cells within a given range (for example 300 to 800)
It is not important how the cells are highlighted, it can be a different colour (like green or blue), or a cross X on top of the cells.
Thanks for the help
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/430118/image.png)
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Rishik Ramena
el 1 de Dic. de 2020
xvalues = 1:5;
yvalues = 1:5;
cdata = randi(20,[5,5]); % range of values in cells < 20
cmap = [repmat([1 0 0],5,1)
repmat([1 1 1],5,1) % highlight all cells with values from 5-10 with white
repmat([0 0 0],10,1)]; % highlight all cells > 10 with black
heatmap(1:5,1:5,randi(20,[5 5]),'Colormap',cmap);
3 comentarios
Rishik Ramena
el 1 de Dic. de 2020
Editada: Rishik Ramena
el 1 de Dic. de 2020
The second argument for repmat denotes the number of rows to be repeated for the RGB vector given in its first argument. So the cmap contains rows of RGB values which are equal in number to the range of values in the cdata (max-min). For visualisation, try imagining filling the colors on the colorbar from the bottom while creating a custom colormap.
max_val = max(cdata(:)) % get the max value from cdata
cmap = [repmat([1 0 0],200,1) % first 200 rows (0-199)
repmat([1 1 1],750-200,1) % 200-749
repmat([0 0 0],max_val-750,1)]; % >= 750
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