...The User-Functions can have arguments given by matrices, infinitely differentiable functions, complex numbers or arbitrary precision integers.
Among the User-Functions you find:
* The integral of f(x) from a to b
* The derivative of f(x)
* The Ternary Conditional
* The gcd of two integers
* Solve a System of Linear Equations
FunctionalCalculator has a Grammar, which allows you to define you own recursive (meta) functions.
The desktop edition has a functional and procedural scripting language based on this grammar and a plotter for complex functions and for real functions.