Fileparts error

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Jaejin Hwang 2012-1-3

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https://ww2.mathworks.cn/matlabcentral/answers/25236-fileparts-error

采纳的回答： Image Analyst

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 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 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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Answer 1

Image Analyst 2012-1-3

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https://ww2.mathworks.cn/matlabcentral/answers/25236-fileparts-error#answer_33132

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 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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Answer 2

Iain Robinson 2012-7-18

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https://ww2.mathworks.cn/matlabcentral/answers/25236-fileparts-error#answer_53899

在 MATLAB Online 中打开

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.