libroot-math-matrix-dev software package provides Matrix library for ROOT - development files, you can install in your Ubuntu 14.04 LTS (Trusty Tahr) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install libroot-math-matrix-dev
libroot-math-matrix-dev is installed in your system.
Make ensure the libroot-math-matrix-dev package were installed using the commands given below,
$ sudo dpkg-query -l | grep libroot-math-matrix-dev *
You will get with libroot-math-matrix-dev package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | Library development |
| Package | libroot-math-matrix-dev |
| Version | 5.34.14-1build1 |
| Description | Matrix library for ROOT - development files |
| Sub Section | libdevel |