Free visualcalc software for pda

VisualCalc is an advanced programmable scientific calculator with complex, array and matrix operations and graphing.
Summary of features:
Real and complex numbers
Arrays and matrix manipulation
Support for conditional computations and looping
Optionally display results in rational fraction format
Trigonometric, logarithmic, complex, statistical, matrix functions
Solution of linear algebraic equations
Unlimited number of user variables
Multiline equations with size up to 16 Kbytes
Saving equations for further work
Function graphs with support for tracing the graphs
Separate display for variables and results
Automatic calculation mode
Ability to interrupt lengthy calculations
Support for comments in the equation text
Customizable fonts for editing and results
Enhancements:
- fixed error in matrix editor