Matlab - Deshabilitar escritura en Uitable

function varargout = tablacaballero18_editable(varargin)

gui_Singleton = 1;

gui_State = struct('gui_Name',       mfilename, ...

                   'gui_Singleton',  gui_Singleton, ...

                   'gui_OpeningFcn', @tablacaballero18_editable_OpeningFcn, ...

                   'gui_OutputFcn',  @tablacaballero18_editable_OutputFcn, ...

                   'gui_LayoutFcn',  [] , ...

                   'gui_Callback',   []);

if nargin && ischar(varargin{1})

    gui_State.gui_Callback = str2func(varargin{1});

end

if nargout

    [varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});

else

    gui_mainfcn(gui_State, varargin{:});

end

function tablacaballero18_editable_OpeningFcn(hObject, eventdata, handles, varargin)

set(handles.uitable1,'ColumnEditable', true(1,2))

set(handles.uitable1,'ColumnName',{'Coord X','Coord Y'})

set(handles.uipanel1,'title','COORDENADAS')

set(handles.uipanel1,'FontWeight','bold')

set(handles.pushbutton1,'string', 'GUARDAR')

set(handles.pushbutton3,'string', 'GUARDAR')

set(handles.pushbutton2,'string', 'EDITAR')

set(handles.edit1,'string','')

set(handles.text2,'string','NODOS')

handles.output = hObject;

guidata(hObject, handles);

function varargout = tablacaballero18_editable_OutputFcn(hObject, eventdata, handles)

varargout{1} = handles.output;

function pushbutton1_Callback(hObject, eventdata, handles)

set(handles.uitable1,'ColumnEditable', false)

function pushbutton2_Callback(hObject, eventdata, handles)

set(handles.uitable1,'ColumnEditable', true(1,2))

function pushbutton3_Callback(hObject, eventdata, handles)

set(handles.pushbutton1,'string', 'GUARDAR')

function edit1_Callback(hObject, eventdata, handles)

nodos=str2double(get(hObject,'String')) ;

num_elem=cell(nodos,2);  %crea una matriz de cells de filas por 2 columnas

num_elem(1:nodos,1:2)={' '};

set(handles.uitable1,'Data',num_elem);