MATLAB error: Undefined function or method X for input arguments of type ‘double’ [duplicate]

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You get this error when the function isn’t on the MATLAB path or in pwd.

First, make sure that you are able to find the function using:

>> which divrat
c:\work\divrat\divrat.m

If it returns:

>> which divrat
'divrat' not found.

It is not on the MATLAB path or in PWD.

Second, make sure that the directory that contains divrat is on the MATLAB path using the PATH command. It may be that a directory that you thought was on the path isn’t actually on the path.

Finally, make sure you aren’t using a “private” directory. If divrat is in a directory named private, it will be accessible by functions in the parent directory, but not from the MATLAB command line:

>> foo

ans =

     1

>> divrat(1,1)
??? Undefined function or method 'divrat' for input arguments of type 'double'.

>> which -all divrat
c:\work\divrat\private\divrat.m  % Private to divrat

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