Fileparts error

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Jaejin Hwang
Jaejin Hwang on 3 Jan 2012
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?
Jaejin Hwang
Jaejin Hwang on 4 Jan 2012
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)
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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Accepted Answer

Image Analyst
Image Analyst on 3 Jan 2012
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.
  1 Comment
Friedrich on 4 Jan 2012
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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More Answers (1)

Iain Robinson
Iain Robinson on 18 Jul 2012
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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