How to: Handling between functions

I want to select a certain file then use that file for calculation.

Currently I constantly need to select it for every calculation;

      [filename, pathname] = uigetfile({'*.xls'},'File Selector');
[num, txt]=xlsread(filename);

what I want is, select file in:

function OpenMenuItem_Callback(hObject, eventdata, handles)

      [filename, pathname] = uigetfile({'*.xls'},'File Selector');

then use for example the 'filename' in a different function:

function pushbutton1_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
axes(handles.axes1);
cla;

popup_sel_index = get(handles.popupmenu1, 'Value');
switch popup_sel_index
    case 1

how do i call the previous selected filename to this function?

[Edited, Jan, code formatted]

Answer 1

[Jan]

You can store the file name for later access:

[filename, pathname] = uigetfile({'*.xls'},'File Selector');
[num, txt]=xlsread(filename);

handles = guidata(FigureHandle);  % If not done before
handles.File = fullfile(pathname, filename);  % Prefer full filenames
guidata(FigureHandle, handles);

...
function pushbutton1_Callback(hObject, eventdata, handles)
handles = guidata(hObject);
disp(handles.File)

This topic has been discussen frequently, such that searching in the forum will reveal other examples. Another good point to start from are Matt Fig's 41 GUI examples.

[Jan]

[Moved from Answer section to Comment section]:

Matlab newbie has written:

 I tried your code but I dont get it. Doesnt work.

 I want to get that filename including data in the function pushbutton.

[Jan]

@Matlab newbie: Please post comments in the comment section. Thanks.

"It does not work" is not detailed enough to suggest an improvement. If you want to store the data in addition, simply do this.

[num, txt]=xlsread(filename);
handles.FileData = num;

It is exactly the same method as for the file name.