Adding means to separate boxplots in the same figure window?

Hello,

I have combined two boxplots into the same figure window but when i go to add the means i seem to be doing something wrong as both means appear on only one of the boxplots:

I was wondering how i can correctly place the means onto the correct boxplots?

The matlab code code i used is:

figure(1)
boxchart([x2,x]);
grid on;
grid minor;
hold on;
plot(mean(x2),'xr');
plot(mean(x),'xr');
hold off;
legend(["","Mean Value"]);
hold off;

Answer 1

[Voss]

When you call plot with one vector argument, that argument is treated as y and x is implicitly taken to be 1:numel(y). Since mean(x2) and mean(x) are both scalars, you get x = 1 in both of those plot calls. To avoid this behavior, explicitly specify the x-coordinate(s) to plot at:

x2 = rand(10,1);
x = rand(10,1);

figure(1)
boxchart([x2,x]);
grid on;
grid minor;
hold on;
plot(1,mean(x2),'xr'); % using x = 1 for x2 (1st column of the matrix sent to boxchart)
plot(2,mean(x),'xr');  % using x = 2 for x (2nd column of the matrix sent to boxchart)
hold off;
legend(["","Mean Value"]);
hold off;