Fileparts error

2012 1 3
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If I run on Matlab 2011b, there is an error like that Error using fileparts Too many output arguments.
Is there alternative way to solve the problem?

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Walter Roberson
Walter Roberson 2012-1-3
Could you post an example?
Could you post the traceback? I'm thinking there is a chance that one of your own functions might be overriding something that fileparts uses.
Jaejin Hwang
Jaejin Hwang 2012-1-4
This is the error. When I use it on 2009a, it is working well.
Error using fileparts
Too many output arguments.
Error in mri_summary (line 21)
[pathstr, name, ext, versn] = fileparts(mess.Name);
Error in mri_gui>SelectInputFile_Callback (line 89)
subject = mri_summary(fullfile(PathName, FileName));
Error in gui_mainfcn (line 96)
feval(varargin{:});
Error in mri_gui (line 42)
gui_mainfcn(gui_State, varargin{:});
Error in @(hObject,eventdata)mri_gui('SelectInputFile_Callback',hObject,eventdata,guidata(hObject))
Error while evaluating uicontrol Callback

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Image Analyst
Image Analyst 2012-1-3

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Are you using some code from a prior version where it could take 4 output arguments? Take note of this note:
Note The fourth output argument of fileparts (file version) is no longer supported and has been removed. Calling the function with more than three output arguments generates a warning and will error in a future version.

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Friedrich
Friedrich 2012-1-4
Yepp. This is a typo in 11b. In 11b the warning was removed and became an error. So remove the 4th output of fileparts to get it working.

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Iain Robinson
Iain Robinson 2012-7-18

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Jaejin, the error is caused because the syntax for the fileparts function has changed between versions of MATLAB.
In MATLAB 2009b (and earlier versions?), the old syntax was:
[pathstr, name, ext, versn] = fileparts(filename)
From MATLAB 2011a onwards the new syntax is:
[pathstr, name, ext] = fileparts(filename)
Using the old syntax in MATLAB 2011a or MATLAB 2011b will generate a warning.
Using the old syntax in MATLAB 2012a will generate an error.
I haven't tested this, but I think if you use the new syntax in any version from MATLAB 2009b onwards it will still work. This is because MATLAB will ignore function outputs that aren't assigned to a variable. By the way, be careful if you are using ~ notation (the tilde) to ignore output arguments. This feature was introduced in MATLAB 2009b, so will break compatibility with earlier versions.

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