filesystem error when saving...

As per my understanding, you are facing “fl:filesystem:SystemError” error while using MATLAB R2022a in Mac with Ventura despite having plenty free disk space.

Please know that this error is a file system error in MATLAB, and can occur due to various reasons, such as permission issues, file system corruption, or conflicts with other programs.

In this case, here are a few suggestions to help you troubleshoot and resolve the issue:

Check file permissions: Make sure you have the necessary permissions to read and write files in the specified directory. You can try changing the permissions or saving the matrix in a different location to see if it resolves the issue.
Verify disk space: Although you mentioned having plenty of free disk space, it's worth double-checking to ensure that you have enough space available for saving the matrix. Sometimes, temporary files or other processes can consume disk space rapidly.
Update MATLAB: Ensure that you are using the latest version of MATLAB and Ventura. Updates often include bug fixes and improvements that can address known issues.
Check for conflicting programs: Determine if there are any other programs running concurrently with MATLAB that might interfere with file operations. Temporarily disabling or closing such programs can help identify if they are causing the issue.
Clear temporary files: MATLAB generates temporary files during its operation. Clearing these files can sometimes resolve file system errors. You can use the“clear” command in MATLAB or manually delete temporary files from the system.
Repair file system: If you suspect file system corruption, you can try running disk utility tools specific to your operating system to repair any potential issues. On macOS, you can use the Disk Utility application.