How to reference a cell from a table within a table

Hi super quick question. I have a table with another set of tables within it read from a folder. I want to plot certain rows from the table within the table, but how can I reference this in Matlab?

Thank you for any help.

Answer 1

[Peter Perkins]

Aron, it sounds like you have tables in a cell array in a table. Dirk is assuming you have "nested tables", which is different but also useful. Assuming you have something like this

t = table({table(rand(5,1),rand(5,1));table(rand(5,1),rand(5,1));table(rand(5,1),rand(5,1))})

t = 3×1 table
       Var1    
    ___________

    {5×2 table}
    {5×2 table}
    {5×2 table}

you should ask yourself how you would get at those tables if the cell array were in your workspace. You'd use braces, right? S ame thing here, only on the var in the table

t.Var1{1}

ans = 5×2 table
     Var1       Var2  
    _______    _______

    0.55235    0.37883
    0.91089    0.68718
    0.66269    0.61634
    0.36953    0.46662
      0.356    0.95732

t.Var1{2}(1:2,:)

ans = 2×2 table
     Var1        Var2  
    _______    ________

    0.79442     0.68389
     0.9692    0.098918

Whether nested tables or tables in a cell array in a table are the right thing to use, I can't say. Both are useful, just for different purposes.

Answer 2

[Dirk Engel]

You can access a specific inner table by its variable name. Consider the following table with two inner tables.

t = table(table(rand(5,1), rand(5,1)), table(rand(5,1)), 'VariableNames', {'InnerTable1', 'InnerTable2'})

t = 5×2 table
       InnerTable1        InnerTable2
     Var1       Var2         Var1    
    __________________    ___________

     0.9087     0.5988      0.17796  
    0.72553    0.69322       0.3135  
    0.91621    0.43767      0.12761  
     0.4482    0.11312      0.62554  
    0.55468    0.50289      0.37345  

To access row 3 of InnerTable1, write

t.InnerTable1(3, :)

However, you can also simply write

t(3, 1)

where column index 1 refers to the outer table's first variable, which here is 'InnerTable1'.

[Aron Wiener]

In my case, however, the table has 57 different cells each with a table wtihin them.

[Voss]

@Aron Wiener: Maybe it'd be convenient to use varfun in your case.

t = table(table(rand(5,1), rand(5,1)), table(rand(5,1)), 'VariableNames', {'InnerTable1', 'InnerTable2'})

t = 5×2 table
         InnerTable1         InnerTable2
      Var1        Var2          Var1    
    _____________________    ___________

      0.5781       0.3214      0.05468  
    0.055876    0.0023291     0.013252  
     0.57597      0.63605      0.99085  
     0.20938      0.10417      0.44687  
     0.86833       0.1974      0.16186  

temp = varfun(@(t)t{3,:},t)

temp = 1×2 table
     Fun_InnerTable1      Fun_InnerTable2
    __________________    _______________

    0.57597    0.63605        0.99085    

data = temp{:,:}

data = 1×3

0.5760 0.6360 0.9908