Error in opening file from another folder, how to fix this problem?

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I have these codes to open and process a .txt file in MATLAB GUI:

[filename1,filepath1]=uigetfile({'*.txt*','Text Files'},...
  'Select Data File');
   cd(filepath1);
 fp= fopen(filename1);
 fgets(fp); 
 A = textscan(fp, '%f');
 fclose(fp);
 eee=A{:};

It works perfectly when opening a file in the same directory of the program, can open multiple files with same button. But when opening a second file in another folder directory, I get this error:

Undefined function 'myGUIprogram' for input arguments
of type 'struct'.
Error in
@(hObject,eventdata)myGUIprogram('pushbutton12_Callback',hObject,eventdata,guidata(hObject))
Error while evaluating uicontrol Callback

Can anybody help me fix it? Thanks in advance!

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dpb 2013-10-4

编辑：dpb 2013-10-4

I've not tried it in a gui but per the doc's uigetfile needs must have the MultiSelect property set to On if want to return multiple files and indicates it's Off by default???

It's a cell array returned in that case, not a single string; not sure how to get the callback to handle the difference; I don't do GUIs so not best to ask; just noticed what looks to me like a shortcoming in the call.

But, I can't get it to allow multiple selection across two subdirectories at all -- I don't think that functionality is supported. I don't know about why the crash, though.

ADDENDUM: Or perhaps I read the question/problem description incorrectly; you mean a multi-select in a subdirectory other than the working directory, not from two separate subdirectories, maybe...well let's see what's different there -- nothing.

I'm coming to conclusion that the error isn't actually related to the above code--post the full error message in context with line numbers and all, not just the error text.

Ekin 2013-10-6

Still multi select but not multi select at the same time, i mean when the button pushed, it loads a file; and push the button again and open another file. The problem is now solved. Thanks anyway.

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