> I need to ''clear'' the value of this Property so that I do not have influence of previous values in the callback I'm current running
You can clear the content of that property using
app.Index = []; % numeric data
app.Index = {}; % cell arrays
app.Index = ''; % character arrays
app.Index = ""; % strings
% etc...
That can be used as a flag to ignore a section of code,
if ~isempty(app.Index)
% stuff
end
Addendum
To create an empty table
app.Index = table();
To clear a table and maintain the headers
app.Index(:,:) = []; % Preserves the class of each column
% or
app.Index = table([],[],{}); % Creates a new 0x3 table and defines classes for each column
