Install grpn by entering the following commands in the terminal:
sudo apt update sudo apt install grpn
Description:
GTK+ reverse polish notation calculator
grpn is an RPN calculator which uses the GTK+ widgets. It works with real and complex numbers, has 4 different radix modes, supports general math functions along with logarithmic and trigonometric functions. Calculator stack is only limited by free memory.
Version: 1.4.1-1
Section: universe/math