freemat-data software package provides freemat data files, you can install in your Debian 9 (Stretch) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install freemat-data
freemat-data is installed in your system.
Make ensure the freemat-data package were installed using the commands given below,
$ sudo dpkg-query -l | grep freemat-data *
You will get with freemat-data package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Mathematics |
| Package | freemat-data |
| Version | 4.2+dfsg1-3 |
| Description | freemat data files |
| Sub Section | Math |