Why do I get the error
I am receiving one of the following error messages. How can I resolve this issue? Undefined function or variable ‹Name›. Unrecognized function or variable ‹Name›. Undefined function or method ‹Name› for input arguments of type ‹ClassName›.
Kshitij Singh answered .
2025-11-20
The error messages you're encountering often arise due to a few common issues in MATLAB. Here are some possible reasons and their solutions:
Typographical Errors:
Ensure that you haven't misspelled the function or variable name. MATLAB is case-sensitive, so check for correct capitalization.
Variable Not Defined:
Ensure that the variable has been defined before you use it. For example, if you try to use a variable x that has not been defined, MATLAB will throw this error.
% This will cause an error if x is not defined
result = x + 1;
Function Not in Path:
Ensure that the function you're trying to call is in the current path or directory. You can use addpath or navigate to the correct directory.
addpath('path_to_function_directory');
File Not Saved:
If you're writing a new function, make sure to save the file with the correct name. The filename should match the function name.
Wrong Input Arguments:
Check if the function is being called with the correct number and type of input arguments. Ensure that the arguments passed match the function definition.
MATLAB Toolbox Missing:
If the function belongs to a specific toolbox, make sure that the toolbox is installed and licensed.
MATLAB Function Shadowing:
Ensure that there isn't a user-defined function or variable shadowing a built-in MATLAB function with the same name. Use which command to locate the function.
which myFunction
By checking these common issues, you can typically resolve the "Unrecognized function or variable" error. Let me know if you need more specific help on any of these points!