How to change a cell table from numeric to string?

Hi, i'm creating a GUI on Matlab and I would like to add a table and be able with pushbuttons to add/delete rows and columns (working with callback functions). This part of my GUI works fine. But my cells are all numeric cells only, and when I write letters, it gives me "NaN". Can someone help? Here is the code:

% --- Executes on button press in pushbutton7.
% ADD ROW %
function pushbutton7_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton7 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
data = get(handles.uitable, 'data');
data(end+1,:) = 0;
set(handles.uitable, 'data', data);

% --- Executes on button press in pushbutton8.  
% ADD COLUMN %
function pushbutton8_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton8 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
data = get(handles.uitable, 'data');
data(:,end+1) = 0;
set(handles.uitable, 'data', data);

% --- Executes when entered data in editable cell(s) in uitable.
% ADD TABLE %
function uitable_CellEditCallback(hObject, eventdata, handles)
%hObject    handle to uitable (see GCBO)
%eventdata  structure with the following fields (see MATLAB.UI.CONTROL.TABLE)
%Indices: row and column indices of the cell(s) edited
%PreviousData: previous data for the cell(s) edited
%EditData: string(s) entered by the user
%NewData: EditData or its converted form set on the Data property. Empty if Data was not changed
%Error: error string when failed to convert EditData to appropriate value for Data
% handles    structure with handles and user data (see GUIDATA)
data = get(hObject,'data');
display(data);

[Guillaume]

Instead of putting a blank line between each lines of code, just put two spaces before each line. That will format the lines as code and will be a lot more readable. Click on the (?) Help button to learn all about the formatting options available.

This is a lot more readable

Than

This

[Stephen23]

@ Adam Taher: please do one of these:

• format the code (you can use the {} Code button just above the textbox, and please remove the blank lines too!.
• delete the code from the text, and upload the file using the paperclip button. You will then need to push Choose file and Attach file.

[Adam Taher]

i'm sorry, i'm new to this. First when I typed it, the preview showed me something even worse, I had to put lines for that. Hopefully now is better.

Answer 1

[Walter Roberson]

You are using GUIDE. Go into the Properties for the uitable and set the 'ColumnFormat' to 'char' for all of the columns you want to now be strings.

[Adam Taher]

There is no 'char' format. There is 'let matlab choose', 'numeric', 'text', 'logical', 'choice list' and 'custom'. I suppose you mean 'text', but even this one doesn't work. Neither 'let matlab choose'