how to call a variable in a button function from another button function

if true
function Open_Callback(hObject, eventdata, handles)
global citra
try
[filename, foldername] = uigetfile('*.jpg'); 
if filename ~= 0
FileName = fullfile(foldername, filename);
end 
  citra = imread(FileName);
  imshow((citra), 'Parent', handles.axes3);
  catch citra
  pesan = 'Input gambar format jpg';
  uiwait(warndlg(pesan));
  stop;
  end  
end

if true
function Run_Callback(hObject, eventdata, handles)
% hObject    handle to Run (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% global citra

if true  
hFH = imfreehand();
gambarmask1 = hFH.createMask();
pesan = questdlg('Lanjutkan Proses?');
  if strcmp(pesan,'No')
      set(handles.Run,'Enable','off');
  end
  if strcmp(pesan,'Cancel')
      set(handles.Run,'Enable','off');
  end
try
  if strcmp(pesan,'Yes')
      hFH2 = imfreehand();
      % Membuat masking dari sebuah area
      gambarmask2 = hFH2.createMask();
      if strcmp(pesan,'No')
          set(handles.Run,'Enable','off');
      end
      if strcmp(pesan,'Cancel')
          set(handles.Run,'Enable','off');
      end
      pesan = questdlg('Lanjutkan Proses?');
      if strcmp(pesan,'Yes')
              hFH3 = imfreehand();
              gambarmask3 = hFH3.createMask();
              if strcmp(pesan,'No')
                  set(handles.Run,'Enable','off');
              end
              if strcmp(pesan,'Cancel')
                  set(handles.Run,'Enable','off');
              end
              pesan = questdlg('Lanjutkan Proses?');
              if strcmp(pesan,'Yes')
                  hFH4 = imfreehand();
                  gambarmask4 = hFH4.createMask();
              else
  end
end
tampung = gambarmask1 + gambarmask2 + gambarmask3 + gambarmask4;
imshow(tampung);
warning = questdlg('Ukur Jaraknya');
if strcmp(warning,'Yes')
     global citra
      I = imread(citra);
      axes(handles.axes3);
      imshow(handles.citra);

I want to call variable citra in button open function from button run function

Answer 1

[Image Analyst]

A variety of ways are covered in the FAQ: http://matlab.wikia.com/wiki/FAQ#How_can_I_share_data_between_callback_functions_in_my_GUI.28s.29.3F

Answer 2

[Azzi Abdelmalek]

If var1 is your variable, when var1 is created or updated:

handles.var1=var1
guidata(hObject,handles)

To call your variable var1 in others functions

var1=handles.var1

[Lidank Abiel]

it not work. error when i want to read the variable after call it.

in button run, i put I = imread(citra);

[Image Analyst]

Well if you aren't going to read the FAQ, then simply put

global I;

inside every function that needs to use I. I'm also recommending that you don't use I (upper case i) as a variable name. It looks too much like 1 and l (lower case L).

[Lidank Abiel]

Thx Mr.Image Analyst for your recommended :)