calculations trial software / shareware for pda

Calculus is advanced calculator with following features:
calculation history list (limited by palm database size)
use of user defined variables and functions in expressions
equation solver with more than 50 equations predefined
built in more than 70 functions (some from Mathlib)
matrix entering and calculations
linear system solving (A x=B)
drop down functions menues
built in unit conversion functions
built in mathematical and physical constants
built in number base conversions (n based)
Sony and Handera HQ display support
simple 2d graph drawing
built in advanced expression parser
Enhancements:
- new equation solver
- increased robustness

Features include:
1. Scientific calculations (trig, log, etc.).
2. Stack of up to 10 last entered values.
3. 20 memory registers.
4. Financial calculation form.
5. Conversion factors that are user editable.
6. Constants that are user editable.
7. History list of last 100 calculations.
8. Cut/paste to allow transfer of values to other apps.
9. Programmability.
10. Statistics form.
11. Binary/Octal/Hex/Fraction displaymodes.
12. Customizable button layout.

Note: Use the "Try-out number form" on the developers website to request a try-out number for the Filmcalculator Software.
The Filmcalculator is a program for people working in the film business. It is mainly useful for D.O.P.s, camera-operators, assistants, clapperloaders and gaffers but also for still photographers and video cameramen.
Primarily developed as a personal tool, the Filmcalculator has grown to a professional program with users world wide. Distribution as shareware makes it legal to make copies for colleagues and gives everybody the opportunity to try the program and decide if they like it before actually buying it.
The program helps with calculations needed while planning or shooting a production.
Filmcalculator calculations
Optical calculations:
Depth of field
Splitfocus
Focal length to lens angle
Lens angle to focal length
Macro calculations:
Magnification factor
Needed diopter
Needed Split diopter
Scale/Model/SFX
Event and screen time to frame rate
Stop motion counter
Screen time to frames
Recommended camera spreed for miniatures
Distance/Size calculations
Distance and object size to focal length
Focal length and object size to distance
Distance and focal length to object size
Matching lens and distance
Matching lens and format
Filmlength/time calculations
Time to filmlength
Shooting time to screen time
Rollsize to filmlength
Filmlength to time
Filmstock counter
Timecode calculator
Lamp and lighting calculations
HMI flickerfree speeds and shutter angles
Beam angle/distance/width conversion
Illumination calculations
User adjustable lamp tables
Color correction
Exposure calculations
Exposure corrections for speed and shutter angle
Exposure changes replacing lights
Electricity calculations
Watts/Volts/Amps/Ohms calculations
Power cable calculations
Generator calculations
General
Sun set/rise and positions
Sun mapping / listing
Moon positions / phases
Info about filters/filmstock/apertures
And more.......
System requirements:
- Palm OS 5.0
- high-res screen

The A+ Scientific Calculator looks great and is easy to use. This fully functional scientific calculator is at the Top of the Class! Features include: Brilliant color graphics Calendar for Date & Time calculations Converter Double-entry number display History includes recent calculations Navigation panel with links to all features.

With this extraordinary calculator, you can see all your previous calculations and their results
Main features:
- Logs all of your calculations
- Custom button you can decide yourself what it does
- Edit your previous calculations
- Calculate with advanced techniques like parentheses and power of