Hello Laura,
I understand that you want to create a heatmap for some range of values and want to highlight some specific cells with values greater than the threshold 200.
In MATLAB, “heatmap" provides you with the functionality to create a heatmap chart with specified values and add colors to them based on those values.
To customize the color of the cells, you can use the “Colormap” parameter and create a custom colormap.
Here's one way to create a custom colormap with a threshold and maxValue value.
% Setting up threshold and maxValue
threshold = 200;
maxVal = 250;
% Custom color map
cmap = [];
% Generating default heatmap till threshold
for i=1:threshold+1
cmap = [cmap; 1 - 0.0035*i , 1 - 0.0020*i, 1-0.0009*i];
end
% Adding different color (red) for values > threshold
cmap = [cmap; repmat([1 0 0], maxVal-threshold-1, 1)];
% plots heatmap with cmap as colormap
figure();
h=heatmap(1:5, 1:5, randi(maxVal,[5 5]));
h.Colormap = cmap;
% set the clim:
clim([0 maxVal]);
You can refer to the below documentation to learn more about "Colormap" in MATLAB.
