How to do combination of color in a single colorbar in a scatter plot?

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Avijit Paul
Avijit Paul 2025-3-15
评论： Voss 2025-3-16
I have one data set of 4964 values "s" varible with latitude and longitude. I want to plot all the positive values with red color (gradually shaded color) using "BREWERMAP Function" link provided. Zero Values in Green color and negative values in blue (Not shaded fix color). Tried many things couldn't able get a desired output. The figure should have a single colorbar. Tried using different axis, but that generate 3 colorbar. Any help will be appreciated.
https://in.mathworks.com/matlabcentral/fileexchange/45208-colorbrewer-attractive-and-distinctive-colormaps
Code
scatter(lon,lat,6,s,"filled");

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Voss
Voss 2025-3-15
Ran in:
Maybe something like this.
load Data
reds = brewermap([],'Reds');
green = [0 1 0];
blue = [0 0 1];
smax = max(s(:));
nr = size(reds,1);
ng = 2;
nb = floor(nr/25);
c = zeros(numel(s),3);
idx = s > 0;
c(idx,:) = reds(ceil(s(idx)*nr/smax),:);
idx = s == 0;
c(idx,:) = repmat(green,nnz(idx),1);
idx = s < 0;
c(idx,:) = repmat(blue,nnz(idx),1);
scatter(lon,lat,6,c,"filled");
colormap([repelem([blue; green],[nb,ng],1); reds])
clim([-(nb+ng/2)/(nr+ng/2),1]*smax)
colorbar()

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