Matlab - push button como slider

function varargout = eslider(varargin)

gui_Singleton = 1;

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

                   'gui_Singleton',  gui_Singleton, ...

                   'gui_OpeningFcn', @eslider_OpeningFcn, ...

                   'gui_OutputFcn',  @eslider_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 eslider_OpeningFcn(hObject, eventdata, handles, varargin)

global valor

valor=0;

set(handles.text1,'string',get(handles.slider1,'Value'))

set(handles.slider1,'Max',300)

handles.output = hObject;

guidata(hObject, handles);

function varargout = eslider_OutputFcn(hObject, eventdata, handles)

varargout{1} = handles.output;

function slider1_Callback(hObject, eventdata, handles)

function pushbutton1_Callback(hObject, eventdata, handles)

global valor

valor=valor+1;

if valor<=300

set(handles.slider1,'Value',valor)

get(handles.slider1,'Value')

set(handles.text1,'string',get(handles.slider1,'Value'))

end

function pushbutton2_Callback(hObject, eventdata, handles)

global valor

valor=valor-1;

if valor>=0

    set(handles.slider1,'Value',valor)

    get(handles.slider1,'Value')

    set(handles.text1,'string',get(handles.slider1,'Value'))

end