MATLAB: Change color of section graph

graphhistogramMATLAB

I need to change the color of each quadrant of the graph, in the code I know I have a map color, but I was wondering if it is possible to manually change each color.
x=-100+(100+100)*rand(1500,1);   
y=-100+(100+100)*rand(1500,1);   
group = (x <= 0) * 2 + (y <= 0) ; 
pointsize = 30; 
scatter(x, y, pointsize, group);     
colormap(jet(4))

Best Answer

Instead of colormap(jet(4)) create the colormap you want as a 4 x 3 array and colormap() it.
cmap = [1 0 0;
        0 1 0;
        0 0 1;
        0 0 0];
colormap(cmap);
Note: your group variable will be 0, 1, 2, or 3 and so will not map directly to a colormap entry. The code I had suggested to you added 1 to group, getting 1, 2, 3, or 4.
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