How to set color for different categories?

[Deleted user]

Thanks for the great project.

The builtin colors are amazing. However, I'd like to specify the color for different categories using the builtin color options. For example, in fig. 1, I need to compare category a vs. b. In fig. 2, I need to compare category b vs. 3. Therefore, I want category b has the same color in different figures.

load fisheriris.mat
x=randn(1200,1)-1;
cat=repmat([1 1 1 2],300,1);
x(cat==2)=x(cat==2)+2;

clear g5
g5=gramm('x',x,'color',cat);

g5.stat_bin('geom','overlaid_bar'); %Overlaid bar automatically changes bar coloring to transparent
g5.set_title('''overlaid_bar''');
figure('Position',[100 100 500 600]);
g5.draw();

Is there a way to specify the color? Thanks.