Matlab - Llamar función desde GUI

function varargout = graficar_una_supericie(varargin)

gui_Singleton = 1;

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

                   'gui_Singleton',  gui_Singleton, ...

                   'gui_OpeningFcn', @graficar_una_supericie_OpeningFcn, ...

                   'gui_OutputFcn',  @graficar_una_supericie_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 graficar_una_supericie_OpeningFcn(hObject, eventdata, handles, varargin)

handles.output = hObject;

guidata(hObject, handles);

function varargout = graficar_una_supericie_OutputFcn(hObject, eventdata, handles)

varargout{1} = handles.output;

function funcion_Callback(hObject, eventdata, handles)

fun=get(hObject,'String');

handles.fun=fun;

guidata(hObject, handles);

function Extremo_a_Callback(hObject, eventdata, handles)

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

handles.a=a;

guidata(hObject, handles);

function Extremo_b_Callback(hObject, eventdata, handles)

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

handles.b=b;

guidata(hObject, handles);

function incremento_Callback(hObject, eventdata, handles)

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

handles.inc=inc;

guidata(hObject, handles);

function graficar_Callback(hObject, eventdata, handles)

fun=handles.fun;

a=handles.a;

b=handles.b;

inc=handles.inc;

[X,Y]=meshgrid(a:inc:b);

f=inline(fun,'x','y');

Z=f(X,Y);

surf(X,Y,Z);

shading flat;

rotate3d on

xlabel('Eje X'),ylabel('Eje Y'),zlabel('Eje Z')

function pushbutton2_Callback(hObject, eventdata, handles)

axes(handles.axes2);

x=linspace(0,2*pi,100);

y=get(handles.edit9,'String')

y=vectorize(inline(y));

y=y(x);

plot(x,y);