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By: Paul Wilkins
paul dot wilkins at analog dot com

grpn screenshot GRPN is a graphical reverse polish notation (RPN) calculator. GRPN is written in C and uses the GIMP Toolkit (GTK) on top of X11. GRPN was developed under Linux but has also been tested under SunOS and Solaris. It should work with almost any UNIX, though.

GRPN works with real numbers and complex numbers. Numbers can be displayed in 4 different radix modes, and complex numbers can be displayed in either Cartesian or polar form.

GRPN uses a stack and reverse polish notation to evaluate expressions. The stack in GRPN is infinite and limited only by available memory.

GRPN supports the following functions:

  • General Math Functions: + - * / sqrt sqr pow neg
  • Exponential and Logarithmic Functions: log alog exp ln
  • Trigonometric Functions: sin asin cos acos tan atan
Both keyboard and mouse operation are fully supported. GRPN can also cut and paste data to/from other X11 applications.

grpn screenshot The options window lets you select the different operating modes.

Here are the changes from version 1.0.

Try it out. Download GRPN (43k):

  • Download (via FTP)
  • Download (via HTTP)