Sub-titles for matrix columns in table - matlab

Question

Here's my toy example:
t = table([1,2,3;4,5,6;7,8,9],[10,11,12;13,14,15;16,17,18]);
t.Properties.VariableNames = {'system1', 'system2'};
t.Properties.RowNames = {'obs1', 'obs2', 'obs3'};
I am wondering if it's possible to assign sub titles to the three columns of every variable, such as {'min', 'mean', 'max'}?

Answer 1

You can put those subtitles within the variables using a cell array like this:
t = table({'min', 'mean', 'max'; 1, 2, 3; 4, 5, 6; 7, 8, 9},...
{'min', 'mean', 'max'; 10, 11, 12; 13, 14, 15; 16, 17, 18});
t.Properties.VariableNames = {'system1', 'system2'};
t.Properties.RowNames = {'.','obs1', 'obs2', 'obs3'};
%if you don't like dot (.) as a row name, replace it with char(8203) to have nameless row
which will give:
t =
4×2 table
system1 system2
________________________ ________________________
. 'min' 'mean' 'max' 'min' 'mean' 'max'
obs1 [ 1] [ 2] [ 3] [ 10] [ 11] [ 12]
obs2 [ 4] [ 5] [ 6] [ 13] [ 14] [ 15]
obs3 [ 7] [ 8] [ 9] [ 16] [ 17] [ 18]

Answer 2

If you're looking for functional solution (e.g. t.system1.min) You can nest sub-tables for system1 and system2 with {'min', 'mean', 'max'} as Variable Names. Visually it won't be as useful as other solutions.
dat1 = [1,2,3;4,5,6;7,8,9];
dat2 = [10,11,12;13,14,15;16,17,18];
s1 = table(dat1(:,1),dat1(:,2),dat1(:,3));
s2 = table(dat2(:,1),dat2(:,2),dat2(:,3));
s1.Properties.VariableNames = {'min','mean','max'};
s1.Properties.RowNames = {'obs1', 'obs2', 'obs3'};
s2.Properties.VariableNames = {'min','mean','max'};
s2.Properties.RowNames = {'obs1', 'obs2', 'obs3'};
t = table(s1,s2);
t.Properties.VariableNames = {'system1', 'system2'};
t.Properties.RowNames = {'obs1', 'obs2', 'obs3'};