Octave is an powerful open source tool used as an alternative to Matlab since it is free and customizable. This tool is used for numerical computations, manupulations of graphs, matrices and some other features.
Octave comes in two forms, a command line engine and a GUI frontend. In order to install Octave in Ubuntu run the following command:
sudo apt-get install octave octave-gtk
To run it, go to the terminal and type
Alternatively, go to Applications and under education there should be an icon that says octave-gtk