如何使条形图从空白变为彩色？

Question

通过遵循 matlab 代码，我想制作彩色条形图，但我得到的数字为 bar-chart，请告诉我如何解决？

col(1,:) = [0 200 0]/255; 
col(2,:) = [0 0 200]/255; 
col(3,:) = [200 0 0]/255; 
x_axis = categorical({'01', '02', '03'});
y_axis = [68.52 80.69 79.38];
figure
b = bar(x_axis, y_axis,'FaceColor','flat');
b.CData = col;
title('Comparison of average accuracy among existing and proposed approach')
xlabel('Serial Number of existing approach and proposed feature')
ylabel('Accuracy')