Matlab - coger datos de una uitable

function varargout = uitable12(varargin)

gui_Singleton = 1;

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

                   'gui_Singleton',  gui_Singleton, ...

                   'gui_OpeningFcn', @uitable12_OpeningFcn, ...

                   'gui_OutputFcn',  @uitable12_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 uitable12_OpeningFcn(hObject, eventdata, handles, varargin)

filas=1; columnas=2;

matriz_editable(1:filas,1:columnas)={''};

set(handles.uitable1,'Data',matriz_editable)

set(handles.uitable1,'ColumnEditable',true(1,columnas))

handles.output = hObject;

guidata(hObject, handles);

function varargout = uitable12_OutputFcn(hObject, eventdata, handles)

varargout{1} = handles.output;

function uitable1_CellSelectionCallback(hObject, eventdata, handles)

a=str2double(get(handles.uitable1,'Data'));

fid=fopen('uitable12.txt','w');

fprintf(fid,'%6.2f',a(1,1));

fclose(fid);