Matlab - Ingresar datos en un arreglo mediante un pushbutton matlab Guide

function varargout = ingresar_datos(varargin)

gui_Singleton = 1;

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

                   'gui_Singleton',  gui_Singleton, ...

                   'gui_OpeningFcn', @ingresar_datos_OpeningFcn, ...

                   'gui_OutputFcn',  @ingresar_datos_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 ingresar_datos_OpeningFcn(hObject, eventdata, handles, varargin)

global i b

b=[];

i=1;

handles.output = hObject;

guidata(hObject, handles);

function varargout = ingresar_datos_OutputFcn(hObject, eventdata, handles)

varargout{1} = handles.output;

function edit1_Callback(hObject, eventdata, handles)

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

handles.a=a;

guidata(hObject, handles);

function pushbutton1_Callback(hObject, eventdata, handles)

global i b

a=handles.a;

b(i)=a

i=i+1;

set(handles.edit1,'string','');