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Saeid
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Saving my own function to be used as MATLAB built-in functions

Asked by Saeid
on 26 Apr 2018
Latest activity Commented on by Saeid
on 27 Apr 2018
I would like to write a function that can be called from anywhere regardless of my current working path, just like I use integral(...) or sin(...). How should I change the setup to be able to do this?

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You are a member of this forum for 2 years now and asked 44 questions. And this is the first time you want to add a user defined folder to the path? I cannot image how you can work with Matlab without saving files to folders in the path.
Believe it or not, this is the first time I really need to do that.

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2 Answers

Answer by Ahmet Cecen on 26 Apr 2018
Edited by Ahmet Cecen on 26 Apr 2018
 Accepted Answer

Create a startup.m file in your MATLAB user folder(usually Documents/MATLAB) then use addpath in that file.
MATLAB will execute that file everytime it starts up, meaning the paths you specify in that file will be "permenantly" available in any folder for all intents and purposes. (At least for all cases someone asking this question will likely encounter.)

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Answer by the cyclist
on 26 Apr 2018
Edited by the cyclist
on 26 Apr 2018

One way is to put any such functions into a particular directory (e.g. "utilities"), and then add that directory to the search path using the addpath command. I put the addpath command in my startup.m file, so it gets called every time I start MATLAB.

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I tried this:
savepath D:\Documents\MATLAB\Examples
and got this message:
Warning: Unable to save path to file 'D:\Documents\MATLAB\Examples'.
You can save your path to a different location by calling SAVEPATH
with an input argument that specifies the full path. For MATLAB to
use that path in future sessions, save the path to 'pathdef.m' in
your MATLAB startup folder.
> In savepath (line 145)
A correct usage of savepath is:
addpath('D:\Documents\MATLAB\Examples', '-end');
savepath
Then the path is saved to the matlabroot folder, but this requires admin privilegs. Therefore it might be better to follow the advice given in the warning message: save the pathdef.m file to your startup folder - the folder which is active initially.
It is not clear, why the saving failed in your case. Is the folder existing and do you have write privileges?

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