'Text' must be character vector issue in app designer

Hi, I'm quite new to MATLAB so please bare with me. I'm assigning the values produced by MATRIX_VALUES from a seperate script to the button names seen below, but I keep getting an 'Text' must be a character vector error on the btn.Text = C{i} line. MATRIX_VALUES(); is a 4x4, and I shaped it to a 1x16 vector, which should fit the loop conditions fine, but I keep getting this error. Any help would be massively appreicated, thanks.

MATRIX_VALUES();
x = reshape(FINAL_Shuffled_Columns,1,[]); 
C = {x}; %Making a cell with the matrix of values from MATRIX_VALUES
mybuttons = {app.Button1,app.Button2,app.Button3,app.Button4,...
    app.Button5,app.Button6,app.Button7,app.Button8,...
    app.Button9,app.Button10,app.Button11,app.Button12,...
    app.Button13,app.Button14,app.Button15,app.Button16};
for i = 1:16
    btn = mybuttons{i};
    btn.Text = C{i};
end

Answer 1

[Voss]

You can store the buttons in an array (not a cell array), and you don't need to put x in a cell array either. Also, reshape is not necessary for this.

The error is because C{i} is numeric (I guess), but the Text property of a button needs to be text (i.e., string or char), so you need to convert the numeric value to text first, e.g., using the string function or the num2str function.

mybuttons = [app.Button1,app.Button2,app.Button3,app.Button4,...
    app.Button5,app.Button6,app.Button7,app.Button8,...
    app.Button9,app.Button10,app.Button11,app.Button12,...
    app.Button13,app.Button14,app.Button15,app.Button16];

for i = 1:numel(mybuttons)
    mybuttons(i).Text = string(FINAL_Shuffled_Columns(i));
end

Also, note that you can convert all values to strings at once before the loop, and then use each inside the loop:

str = string(FINAL_Shuffled_Columns);
for i = 1:numel(mybuttons)
    mybuttons(i).Text = str(i);
end

[Callum]

Hi Voss,

Yeah that works, thank you for your reply!

[Voss]

You're welcome!