Argument to dynamic structure reference must evaluate to a valid field name Error occurs when using properties

I am trying to use transfer my functional script into App Designer to make it function as a GUI. First thing I did was define all the variables in properties that are going to be used and modified between callbacks:

properties (Access = private)
    RTD = cell(5,3);TC = cell(5,3);
end

In my script each cell of RTD is a 5999x9 table, and I am able to referrence the following without errors:

RTD{1,1}.(1)
RTD{1,1}.(1)(1)

But since I made RTD a property in App Designer this causes the error message: "Argument to dynamic structure reference must evaluate to a valid field name":

app.RTD{1,1}.(1)
app.RTD{1,1}.(1)(1)

In the App Designer, I must reference the property RTD as app.RTD.

Does anyone know why this happens and how I could fix it? My only idea would be to make a local variable equal to RTD within the function callback that I need to use RTD in, and then once I am done modifying it, make app.RTD equal to the local variable.

Answer 1

[Bora Eryilmaz]

Looks like you might be trying to access the content of RTD before populating its cells with the right table content first.

% This works OK.
RTD = cell(5,3);
RTD{1,1} = array2table(rand(10,3));
RTD{1,1}.(1)

ans = 10×1

0.0727 0.7871 0.6981 0.6895 0.7415 0.3404 0.9245 0.7131 0.6452 0.6807

% Errors out since the table content is not assigned into the cell array.
RTD = cell(5,3);
RTD{1,1}.(1)

Argument to dynamic structure reference must evaluate to a valid field name.