Undefined function 'workspacefunc' — How to change search path back after accidentally changing it

Question

Bill Tubbs 2020-7-24

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/570247-undefined-function-workspacefunc-how-to-change-search-path-back-after-accidentally-changing-it

评论： Walter Roberson 2020-7-25

I couldn't remember the function to check if a directory exists so I typed the following, and then accepted the suggested correction:

>> ispath('plots')
Unrecognized function or variable 'ispath'.
 
Did you mean:
>> path('plots')
Warning: Name is nonexistent or not a directory: /Users/billtubbs/gel-2005/notes/10/plots 
> In path (line 34) 
com.mathworks.jmi.MatlabException: Method 'workspaceUpdated' is not defined for class 'internal.matlab.variableeditor.MLNamedVariableObserver' or is removed from MATLAB's search path.
com.mathworks.jmi.MatlabException: Method 'workspaceUpdated' is not defined for class 'internal.matlab.variableeditor.MLNamedVariableObserver' or is removed from MATLAB's search path.
com.mathworks.jmi.MatlabException: Method 'workspaceUpdated' is not defined for class 'internal.matlab.variableeditor.MLNamedVariableObserver' or is removed from MATLAB's search path.
com.mathworks.jmi.MatlabException: Method 'workspaceUpdated' is not defined for class 'internal.matlab.variableeditor.MLNamedVariableObserver' or is removed from MATLAB's search path.
com.mathworks.jmi.MatlabException: Method 'workspaceUpdated' is not defined for class 'internal.matlab.variableeditor.MLNamedVariableObserver' or is removed from MATLAB's search path.
com.mathworks.jmi.MatlabException: Method 'workspaceUpdated' is not defined for class 'internal.matlab.variableeditor.MLNamedVariableObserver' or is removed from MATLAB's search path.
com.mathworks.jmi.MatlabException: Method 'workspaceUpdated' is not defined for class 'internal.matlab.variableeditor.MLNamedVariableObserver' or is removed from MATLAB's search path.
com.mathworks.jmi.MatlabException: Method 'workspaceUpdated' is not defined for class 'internal.matlab.variableeditor.MLNamedVariableObserver' or is removed from MATLAB's search path.
com.mathworks.jmi.MatlabException: Method 'workspaceUpdated' is not defined for class 'internal.matlab.variableeditor.MLNamedVariableObserver' or is removed from MATLAB's search path.
com.mathworks.jmi.MatlabException: Method 'workspaceUpdated' is not defined for class 'internal.matlab.variableeditor.MLNamedVariableObserver' or is removed from MATLAB's search path.

Now I get these errors whatever command I type (including path). I can't even quit MATLAB.

How do I recover from this situation?

Ideally I would like to restore whatever paths I had set up before typing the above command.

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Bill Tubbs 2020-7-24

Maybe I am mistaken. It's mentioned by MathWorks Support Team in the link above as a possible remedy:

sudo chmod 777 $MATLABROOT/toolbox/local/pathdef.m

Anyway, it doesn't work ("No such file or directory") as you suggest. I commented on the post to that effect.

Walter Roberson 2020-7-25

The environment variable MATLABROOT is not expected to exist; where the documentation refers to $MATLABROOT it is described as being the MATLAB installation directory. It is an abbreviation for writing in "MATLAB Installation directory path goes here".

It can be misleading to people who are accustomed to actual environment variables.

MATLAB will not pay any attention to an environment variable MATLABROOT when it is executing; MATLAB constructs its notion of matlabroot() based upon the location of the MATLAB executable.

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