Matlab - Dos dudas en Guide

function varargout = portada(varargin)

gui_Singleton = 1;

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

                   'gui_Singleton',  gui_Singleton, ...

                   'gui_OpeningFcn', @portada_OpeningFcn, ...

                   'gui_OutputFcn',  @portada_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 portada_OpeningFcn(hObject, eventdata, handles, varargin)

handles.output = hObject;

uicontrol('Style','pushbutton',...

'Units','normalized',...

'Position',[.3 .06 .2 .07], ...

'String','Continuar',...

'Callback','close all;clc;INVFISIOLOGIA');

axis off

guidata(hObject, handles);

function varargout = portada_OutputFcn(hObject, eventdata, handles)

varargout{1} = handles.output;