Matlab asks me to install Arduino package at every session (Linux)

Every time I start Matlab and try to use the Arduino package I get the following message:

>> a = arduino('/dev/ttyUSB0', 'Uno')
You need the MATLAB Arduino support package before you can use this feature. Open Support Package Installer to install support for additional MATLAB hardware.

I install it and everything goes fine, no errors. If I restart Matlab and try to use the Arduino package again I get the above message again. Is there anyway to keep the Arduino package installed?

I'm on Ubuntu 14.04 64 bit and Matlab R2015b.

Answer 1

[Sudhanshu Bhatt]

Hi Joan,

I understand that every time MATLAB is restarted the Audrino Support package gets removed.

Some of the possible reasons this behavior could happen:

1) If the support package folders are being installed in a temporary folder.

2) If you are executing the RESTOREDEFAULTPATH command this could remove the support packages from the MATLAB Path.

To fix this issue, you can try the following solutions:

1) You can try installing the support package in another folder.

2) Also, after installing the support package you can check the installation directory to see if the files are present.

Hope this helps.

If this does not resolve your issue, you can create a Technical Support Ticket .

Thanks

Sudhanshu Bhatt

[Joan Aguilar Mayans]

Hi Sudhanshu,

I use the Support Package Installer to install the package. The files seem to be in ~/Documents/MATLAB/SupportPackages/R2015b/. I tried adding this path using 'addpath' but with no luck (Matlab still asks to install the arduino package even though the folders are full already).

My startup file does not contain any line that would execute RESTOREDEFAULTPATH. Unless there is something else that could execute it, I would assume it is not.

Thanks!

[Walter Roberson]

Installation of the support packages also changes something in prefdir

Note: for some of the versions before R2015b, some MS Windows users find that they need to Run as Administrator in order to install support packages permanently. I think I read that it was fixed, but I am not certain. This has to do with whether the support package is to be installed for the one user or for everyone on the machine, which is a tension that exists on Linux as well -- installing only for the user does not require writing to protected directories but installing for everyone does require writing to protected directories.

[Joan Aguilar Mayans]

Yes, I thought about this too, but I can't run Matlab using sudo as I get a license error. Specifically:

License checkout failed.
License Manager Error -9
Your username does not match the username in the license file.