YarrRPN is a clean, elegant, easy-to-use and powerful RPN calculator for your iPhone or iPod.

When you hold your iPhone/iPod upright, YarrRPN is a basic calculator with a easy-to use layout. The percent function is awesome for calculating sales taxes, tips at a restaurant, etc.

Tilt the device sideways and YarrRPN turns into a powerful scientific calculator with a wealth of useful functions. But rest assured: all this functionality doesn't clutter the calculator's layout.

#### Features:

• Reverse Polish Notation (a.k.a. postfix, stack-based)
• High precision engine that can handle very small and very large numbers
• Behavior inspired by HP calculators
• Memory slot
• Undo function
• Basic arithmetic functions
• Percentage function
• Basic stack operatione (push, pop, swap, clear)
• Enter exponential numbers using the "EEX" key (e.g: "6.02E23")
• Basic scientific functions like nth root, sqrt, square, pow, 1/x, etc.
• 24 Trigonometric functions that support both radians and degrees:
• Basic: sin, cos, tan, csc, sec, cot
• Inverse: asin, acos, atan, acsc, asec, acot
• Hyperbolic: sinh, cosh, tanh, csch, sech, tanh
• Inverse Hyperbolic: asinh, acosh, atanh, acsch, asech, acoth
• base e and base 10 logarithmic and exponential functions
• Statistical functions: Mean (average), Standard Deviation, factorial (n!)
• Tip: use undo function to calculate std. dev. after calculating mean on a set of numbers
• Optional Key click sound
• Optional vibrate (or beep on iPod) on illegal operation
• Optional animated screen gloss

What is an RPN Calculator? In a nutshell: Instead of entering "3 + 4 =", you enter "3 4 +". With RPN, you don't need parenthesis. It's very efficient for doing complex calculations. Once you get used to RPN, you won't ever want to go back. Learn more about RPN

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