Matlab - borrar contenido de edit text

function varargout = limpiar(varargin)

gui_Singleton = 1;

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

                   'gui_Singleton',  gui_Singleton, ...

                   'gui_OpeningFcn', @limpiar_OpeningFcn, ...

                   'gui_OutputFcn',  @limpiar_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 limpiar_OpeningFcn(hObject, eventdata, handles, varargin)

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

handles.output = hObject;

guidata(hObject, handles);

function varargout = limpiar_OutputFcn(hObject, eventdata, handles)

varargout{1} = handles.output;

function edit1_Callback(hObject, eventdata, handles)

hola= get(hObject,'String')

function pushbutton1_Callback(hObject, eventdata, handles)

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

function limpiar_OpeningFcn(hObject, eventdata, handles, varargin)

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

handles.output = hObject;

guidata(hObject, handles);

function varargout = limpiar_OutputFcn(hObject, eventdata, handles)

varargout{1} = handles.output;

function edit1_Callback(hObject, eventdata, handles)

hola= get(hObject,'String');

handles.hola=hola;

guidata(hObject, handles);

function pushbutton1_Callback(hObject, eventdata, handles)

hola=handles.hola;

 set(handles.text2,'String',hola)

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