要通过Java / Matlab获取Matlab的保存路径？

Question

I am trying to install WFDB Toolbox system-unspecifically in my systems (Ubuntu Linux 64bt/OS X El Capitan/Windows 10 education). I need to get the Matlab Path ie set in /usr/local/MATLAB/R2016a/toolbox/local/pathdef.m by Java/Matlab own means. However, I did not find an approach for that. Pseudocode

matlabpath=char(java.lang.System.getProperty('user.path'));

where I tried in path also matlabpath .

I have specific locations where I keep sufficient permissions for Matlab. I need the approach ie user.path such that I know where I need to keep sufficient privileges. Warning that I get when installing WFDB in Ubuntu Linux 64 bit and Matlab 2016a, which is a complication of not being able to manage the path non-system-specifically

Warning: Unable to save path to file '/usr/local/MATLAB/R2016a/toolbox/local/pathdef.m'. 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 169) 

Java would be the best solution for this, but Matlab's own solution is ok too.

---

How can you get Matlab's path by Java/Matlab?

Answer 1

The "MATLAB Startup Folder" can mean many things depending upon the user's configuration as well as the operating system.

The Mathworks has a whole page about this here .

One way is to ensure that the startup folder is the same as the userpath (how you do this depends on your OS so see the link above). Then you can access that from within MATLAB using the userpath command.

folder = userpath

If you're on Linux, you can ensure that the userpath is used as the Startup Folder by following this excerpt from the link above.

Default Folder on Linux Platforms

On Linux® platforms, the default startup folder is the folder from which you started MATLAB.

To specify the userpath as the startup folder, set the value of the environment variable MATLAB_USE_USERWORK to 1 before startup. By default, userpath is userhome/Documents/MATLAB, and MATLAB automatically adds the userpath folder to the top of the search path upon startup. To specify a different folder for userpath, and for other options, use the MATLAB userpath function.

There is another option (on newer versions of MATLAB) that would allow the user to set their startup path to whatever they want and you still be able to determine it.

Since R2014b, users can specify the initial working path in the preferences ( MATLAB General -> Initial Working Folder ). You can check if the user has specified a custom initial working directory using the following commands

settings = Settings;
folder = settings.matlab.workingfolder.InitialWorkingFolder;

Disclaimer : This functionality was discovered by looking at MATLAB's own matlabrc file and while there is some documentation for Settings it's likely not officially supported, so use at your own risk.