Use a single variable name/label with the dot notation, to get access to a table content

Hi, I have a table called "mydata"

>> class(mydata)
ans = 'table'

from which I usually retreive data (stored in its columns) throught the following dot notation command:

mydata.BLUE
mydata.GREEN
mydata.WHITE
...

This time, I would like to use a single "table variable name/label" which contains all the "columns names"

label = {'BLUE','GREEN','WHITE'}

in order to get access to all the data I need. Something like this, that obviously does not work:

for i = 1 : 3
    mydata.label(i)
end

Any suggestion?

P.S.: I am not sure if I used the correct matlab terminology to explain my question and for the corresponding title. If both title and question are not clear, I will change them.

[Stephen23]

See https://www.mathworks.com/help/matlab/matlab_prog/access-data-in-a-table.html

Syntaxes given in the documentation for returning the content of one column/variable:

mydata = array2table(randi(9,5,3), 'VariableNames',{'BLUE','GREEN','WHITE'})

mydata = 5x3 table
    BLUE    GREEN    WHITE
    ____    _____    _____

     1        2        7  
     1        9        5  
     1        6        4  
     4        4        1  
     5        7        2  

mydata.('BLUE') % dot notation

ans = 5×1

1 1 1 4 5

<mw-icon class=""></mw-icon>

<mw-icon class=""></mw-icon>

mydata{:,'BLUE'} % curly braces

ans = 5×1

1 1 1 4 5

<mw-icon class=""></mw-icon>

<mw-icon class=""></mw-icon>

Answer 1

[Walter Roberson]

labels = mytable.Properties.VariableNames;
for i = 1 : length(labels);
    mydata.(labels{i})
end

Also consider using varfun()

[Sim]

Perfect, exactly what I needed!

Many many thanks @Walter Roberson :)

Answer 2

[POOJA]

You can use dot notation to refer to any individual variable within a table.

x = mytable.Xdata;

y = mytable.Ydata;

The first line of code extracts the variable Xdata from the table mytable and stores the result in a new variable named x. Similarly, the second line of code extracts the variable Ydata into y.

Task

Visualize the letter by plotting the X variable of letter on the horizontal axis and the Y variable on the vertical axis.

HintSee SolutionReset

Submit

Incorrect

Is there a plot?

Does the plot have the correct data?

Hint

Pass letter.X and letter.Y to the plot function.