Undefined function for input arguments of type 'char'.

Question

Aaron Smith 2017-5-23

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/341512-undefined-function-for-input-arguments-of-type-char

评论： Ismet 2022-12-19

Window_one.m

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

2 个评论
显示无隐藏无

Muthukumar Gopalsamy 2020-5-30

"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

Rishav Saha 2021-4-10

Thank you Muthukumar Gopalsamy. I had spaces in file name that's why it was not working.

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Jan 2017-5-23

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/341512-undefined-function-for-input-arguments-of-type-char#answer_268060

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 个评论
显示无隐藏无

Aaron Smith 2017-5-23

在 MATLAB Online 中打开

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 2017-5-26

@Aaron: The error message is clear: The variable "myFile" has not been created before.

请先登录，再进行评论。

Answer 2

Guillaume 2017-5-23

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/341512-undefined-function-for-input-arguments-of-type-char#answer_268062

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.