MATLAB: How to display two separate tables with 2 column headings the same side-by-side

MATLABside by sidetable

I need to display two separate tables side by side with different row lengths and both tables have the same column headings.
Please see the expected table for how the data should look like.
Thank you in advance

Best Answer

First you need to pad the shorter table so it matches the same number of rows as the longer table. The two decisions you need to make are 1) what value should be used as a pad and 2) where should the padded rows be added - to the end, beginning, at certain rows, etc. This demo pads table 2 with NaN values at the end of the table. 
% Create demo data, T2 has less rows than T1; both have same headers.
T1 = table({'A';'B';'C';'D';'E'},rand(5,1),rand(5,1),'VariableNames',{'HighFiberDiet','Aerobic','Anaerobic'}); 
T2 = table({'A';'B';'C';'D'},rand(4,1),rand(4,1),'VariableNames',{'HighFiberDiet','Aerobic','Anaerobic'}); 
% Pad T2 to match the number of rows in T1;  this creates a table of 
% NaN values and adds them to T2.  
T2Pad = [T2;array2table(nan(size(T1,1)-size(T2,1),size(T2,2)),'VariableNames',T2.Properties.VariableNames)];
Now T2Pad and T1 have the same number of rows.
To concatenate both tables with the same headers side-by-side, you can use mergevars() (requires Matlab release >=r2018a) along with the MergeAsTable option to create two sub-tables. I named the two super-tables Table_1 and Table_2. 
 T3 = [mergevars(T1,T1.Properties.VariableNames,'NewVariableName','Table_1','MergeAsTable',true),...
    mergevars(T2Pad,T2Pad.Properties.VariableNames,'NewVariableName','Table_2','MergeAsTable',true)];
The result:
T3 =
  5×2 table
                   Table_1                                   Table_2               
    HighFiberDiet    Aerobic     Anaerobic    HighFiberDiet    Aerobic    Anaerobic
    ______________________________________    _____________________________________
        {'A'}        0.081273     0.11895        {'A'  }       0.70981    0.086412 
        {'B'}         0.84107     0.86276        {'B'  }       0.50521     0.21126 
        {'C'}          0.7004     0.94128        {'C'  }       0.27705     0.30743 
        {'D'}         0.61522     0.70038        {'D'  }       0.88835     0.64141 
        {'E'}        0.013579     0.39019        {[NaN]}           NaN         NaN
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