Fileparts error

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?

[Walter Roberson]

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]

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

Answer 1

[Image Analyst]

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.

[Friedrich]

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.

Answer 2

[Iain Robinson]

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.