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Undefined function for input arguments of type 'char'.

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Aaron Smith
Aaron Smith on 23 May 2017
I have a GUI window with only two push buttons. Upon clicking the first, the callback will generate a uidir to select a folder from which to work. Then the file will be reformatted and saved as a collection of smaller files. This works well. The other pushbutton is simply intended to close this current window and open another. The problem is that when I open the figure and press pushbutton one i get the following error:
Undefined function 'Window_one' for input arguments of type 'char'.
Error in @(hObject,eventdata)Window_one('pushbutton1_Callback',hObject,eventdata,guidata(hObject))
Error while evaluating uicontrol Callback
I have not used the handles structure in this window as there are no variable shared between callbacks and there is no figure to update. In my experience a shortage of or mistake in the declaration of handles is the reason for this error so I am slightly confused as to what the error might be caused by. Does anyone have any idea what may cause this error to arise? There are no cases on Mathworks answers of this having arisen in the same scenario with the error occurring with a GUI window.
I have attached the code along with this question

  1 Comment

Muthukumar Gopalsamy
Muthukumar Gopalsamy on 30 May 2020
"Undefined function for input arguments of type 'char'"
One of the possible reason for such error is if your file name contain white spaces.
Eg: window one.m is not valid instead window_one.m is valid.
This can be found be commenting all your routine and just empty file. Still error is thrown then its sure file name or directory where it exist not correct.
If not then one of your routine maybe not having function definition

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Answers (4)

Jan
Jan on 23 May 2017
You have posted the code of the function Window_one. The error message shows, that the file "Windows_one.m" cannot be found. Has the code been saved to this file? Is there a typo in the file name? Is the file contained in one of the folders of your Matlab path?

  2 Comments

Aaron Smith
Aaron Smith on 23 May 2017
You were correct about the path. I had moved the figure into a folder of its own. Now there is another smattering of errors
Error using struct2handle
Error while evaluating uicontrol CreateFcn
Undefined function or variable 'myFile'.
Error in Window_one>pushbutton1_Callback (line 84)
if ~isdir(myFile) % if the directory is not a valid path
Error in gui_mainfcn (line 96)
feval(varargin{:});
Error in Window_one (line 42)
gui_mainfcn(gui_State, varargin{:});
Error in @(hObject,eventdata)Window_one('pushbutton1_Callback',hObject,eventdata,guidata(hObject))
Error while evaluating uicontrol Callback
Undefined function or variable 'myFile'.
Error in Window_one>pushbutton1_Callback (line 84)
if ~isdir(myFile) % if the directory is not a valid path
Error in gui_mainfcn (line 96)
feval(varargin{:});
Error in Window_one (line 42)
gui_mainfcn(gui_State, varargin{:});
Error in @(hObject,eventdata)Window_one('pushbutton1_Callback',hObject,eventdata,guidata(hObject))
Error while evaluating uicontrol Callback
Is this likely due to issues with save paths and directories as well_ If so this is going to be a major problem as I have files that need to be taken from several folders
Jan
Jan on 26 May 2017
@Aaron: The error message is clear: The variable "myFile" has not been created before.

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Guillaume
Guillaume on 23 May 2017
I assume the callback itself is defined in the associated GUI figure.
One possibility is that by the time the callback is called, the current directory has been changed (with cd or through matlab gui) so your Window_one gui function is no longer on the path.

  2 Comments

Muhammad Qasim Khan
Muhammad Qasim Khan on 23 Apr 2018
"!! Submission failed: Undefined function 'makeValidFieldName' for input arguments of type 'char'." please help me
Walter Roberson
Walter Roberson on 23 Apr 2018
Please show the complete error message, everything in red.

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HABTE TADESSE LIKASSA
HABTE TADESSE LIKASSA on 20 Oct 2018
Undefined function 'norm' for input arguments of type 'char'.
Error in DRMF (line 31) Y1 = X/norm(X,'fro');
Please how can I tackle this problem, can u help me ?

  1 Comment

Walter Roberson
Walter Roberson on 20 Oct 2018
This appears to be an unrelated question possibly involving https://ibug.doc.ic.ac.uk/resources/drmf-matlab-code-cvpr-2013/

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shazil shoukat
shazil shoukat on 20 Sep 2019
Undefined function 'Program' for input arguments of type 'char'.
this error occur when i run the code . what can i do

  1 Comment

Steven Lord
Steven Lord on 20 Sep 2019
Show us how you tried to run the code. My suspicion is that you tried to call a function using its full path like:
>> cd c:\
>> Program Files\MATLAB\R2019a\toolbox\matlab\general\bench
which is not going to work.

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