MATLAB: Is there a way to use the own function file for a Matlab function

functions

Dear Matlab users,

I would like to know if it is possible to substitute a Matlab function with my own .m file? Why I want do to this: I process a lot of imaging data and I seem to run out of Image_Toolbox licenses sooner than Matlab licenses. The processing pipeline seems to use only `imerode` function from the toolbox, so I wrote my own function `own_imerode.m`. Luckily, it is quite straight-forward. However, I would like not to replace `imerode` with `own_imerode` throughout the code for two reasons – backward compatibility and hassle of going through the code. Instead, I was wondering if it is possible to tell Matlab to somehow use `own_imerode` when `imerode` is called, like an alias in a bash shell? I guess, one way would be to call my function also `imerode` and place the path to it on top of the list. Is there another way?

Best, Renat.

Best Answer

Renat, the root cause appears to be a lack of purchased toolboxes. Also you seem to process a lot of images. So I suggest you also look for accessing a cluster. You might have a MATLAB Distributed Computing Server license at your institution.

Beside that, I would not fiddle with the installation. You may want to a simple IF THEN ELSE statement at the beginning that looks for the toolbox being available and if yes use it and if not the alternative way. Command to use could be:

license('test','Image_Toolbox')

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You might also look at the command "restoredefaultpath".

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NEWER ANSWER

FileLoc = dir('/license/license.json')
IsFileThere = ~isempty(FileLoc) && any(~[FileLoc.isdir]);

NEW ANSWER

exist behaves differently when searching for a file vs a dir. For a file search, it will search for file name in the matlab path, a partial match from the right hand side are valid. SO

   exist('/license/license.json', 'file')   %Works because it's searching:
        1) matlabpath/**/license/license.json    (if fail, look at root)
        2) root/license/license.json

When looking for a directory, the leading slash is immediately treated as the root directory. It doesn't seem to be looking for a partial match, unless the leading slash is removed.

   exist('/license', 'dir')    %Looks immediately for root/license
   exist('license', 'dir')     %Looks at matlab path, but NOT root or elsewhere

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The first '/' is treated as the hard drive ("C:\") for Windows 10 at least.

exist('/Users', 'dir') should work
exist('/Users/brian/apps/copilot/license', 'dir') should work
exist('/license', 'dir') should not work, because your license folder is NOT 
                         at '/license' but '/Users/brian/apps/copilot/license' 
exist('license', 'dir)  should work, because you are now looking for CURRENT_FOLDER/license, where
                        CURRENT_FOLDER = '/Users/brian/apps/copilot'

Best Answer

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