Mark smallest bar in 3-D bar plot

I have a 3d bar plot where the height of a bar resembles the mean squared error of a function estimator. Wit my code I find the combination of simplex and order which results in the lowest mean squared error which is 6 and 5 respectively. The color of the bars is already in corresponding to its height, however due to the small varaition it is not visible which is actually the smallest. Therefore, I would like to put a marker (arrow, diamond, etc) on the smallest bar.

figure(2)
bar = bar3(mse_mat);
for i = 1:size(mse_mat,2)
    zdata = ones(6*size(mse_mat,1),4);
    k = 1;
    for j = 0:6:(6*size(mse_mat,1)-6)
      zdata(j+1:j+6,:) = mse_mat(k,i);
      k = k+1;
    end
    set(bar(i),'Cdata',zdata)
end
xlabel('Simplex order')
ylabel('Number of simplices')
yticks((2:2:max_simplices)/2)
yticklabels(split(num2str(2:2:max_simplices)))

Answer 1

[Dana]

My default built-in function for drawing arrows in plots is annotation but I believe that only works in 2-D. As a work-around for 3-D, you can probably make something happen with the text function (using the x,y,z syntax). You could also try the arrow function from the File Exchange.