gnuplot-qt software package provides Command-line driven interactive plotting program. QT-package, you can install in your Debian 8 (Jessie) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install gnuplot-qt
gnuplot-qt is installed in your system.
Make ensure the gnuplot-qt package were installed using the commands given below,
$ sudo dpkg-query -l | grep gnuplot-qt *
You will get with gnuplot-qt package name, version, architecture and description in a table
| Distro | Debian 8 jessie |
| Section | Mathematics |
| Package | gnuplot-qt |
| Version | 4.6.6-2 |
| Description | Command-line driven interactive plotting program. QT-package |
| Sub Section | Math |