Genius Calculator is a precision calculator for Gnome Desktop Environment.

Features of Genius:

 * arbitrary precision integers (2-36), multiple precision floats
 * uses rationals when possible
 * will calculate and show half calculated expressions if the calculation
   could not be completed
 * variables
 * user functions
 * variable and function references with C like syntax
 * anonymous functions
 * it will add missing parenthesis on the ends of expressions (only in
   the GUI version)
 * matrix support
 * complex numbers
 * more ...

http://www.5z.com/jirka/linux.html#genius