run can execute a script not on the MATLAB path if its input argument specifies the path to the script. To run a script by simply entering its name, you should use cd to navigate to the appropriate folder or addpath to add the folder to the MATLAB search path.

scriptname can access any variables in the current workspace.

run changes to the folder that contains the script, executes it, and resets back to the original folder. If the script itself changes folders, then run does not revert to the original folder, unless scriptname changes to the folder in which this script resides.

If scriptname corresponds to both a .m file and a P-file residing in the same folder, then run executes the P-file. This occurs even if you specify scriptname with a .m extension.

If a script is not on the MATLAB path, executing the run command caches the script. In the same session and after calling run, you can edit the script using an external editor. Call clear scriptname before calling run again to use the changed version of the script rather than the cached version. If you edit the script with the MATLAB editor, run executes the changed version and there is no need to call clear scriptname.