Matlab - problemas con axes en GUI de matlab

function varargout = panel1caballero(varargin)

%problemas con axes en GUI de matlab

gui_Singleton = 1;

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

                   'gui_Singleton',  gui_Singleton, ...

                   'gui_OpeningFcn', @panel1caballero_OpeningFcn, ...

                   'gui_OutputFcn',  @panel1caballero_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 panel1caballero_OpeningFcn(hObject, eventdata, handles, varargin)

scrsz=get(0,'ScreenSize');

pos_act=get(gcf,'position');

xr=scrsz(3)-pos_act(3);

xp=round(xr/2);

yr=scrsz(4)-pos_act(4);

yp=round(yr/2);

set(gcf,'Position',[xp yp pos_act(3) pos_act(4)]);

A=imread('fondo.jpg');

set(handles.axes2,'Visible','off');

image(A,'Parent',handles.axes1)

set(handles.axes1,'Visible','off');

handles.output = hObject;

guidata(hObject, handles);

function varargout = panel1caballero_OutputFcn(hObject, eventdata, handles)

varargout{1} = handles.output;

function entrada_Callback(hObject, eventdata, handles)

function entrada_CreateFcn(hObject, eventdata, handles)

if ispc && isequal(get(hObject,'BackgroundColor'),...

    get(0,'defaultUicontrolBackgroundColor'))

    set(hObject,'BackgroundColor','white');

end

function calculo_Callback(hObject, eventdata, handles)

t=0:pi/180:2*pi;

v=cos(t)+sin(t);

axes(handles.axes2);

plot(t,v),title('figura de prueba')