# Description

My RPN calculator is a scientific and financial calculator inspired by the Hewlett-Packard HP-10C series pocket calculators of the 80s, most notably the HP 11C and HP 15C models.

These software version has borrowed the RPN (Reverse Polish Notation) and the look&feel of those calculators. It features classical 4 operations, logarithms, trigonometry, statistics, and macros for easy programming. It also features complete support for complex numbers along with 2nd, 3rd, and 4th degree equations solving.

Its unique magenta L key allows switching from one layout to another, thus saving space on small displays like smartphones without compromising usability.

Support for gestures allows switching from one keyboard to another by swiping left or right, and a light swipe up or down on a key executes the associated f or g function, without any need to actually press the f or g key.

See the web pages of the application at http://calc.lsrodier.net for complete keys description and samples.

My RPN calculator is compatible with all devices running Android 2.1 and up and supports both horizontal and vertical orientations. It does however requires a device with a minimum screen resolution of 320x480 (or 480x320 according to orientation). Note that tablet screens 1280x800 are properly managed.

Summary of the main functions:

* RPN input

* Portrait/landscape and multi-resolution layouts

* Gesture support for extended/simplified inputs

* Arithmetic functions (+, -, x, /, 1/x, +/-, etc)

* Trigonometry, logarithms, hyperbolic trigonometry

* Percentages (+, -, variation, total)

* Dates

* Complete complex numbers support

* 2nd, 3rd, and 4th grade equations solving

* Unit conversions (temperatures, distances, etc)

* Macros for simple programming tasks

Summary of the main statistical functions:

* 1- and 2-variable statistics

* Sums (Σx, Σx2, Σy, Σy2, Σxy)

* Mean, weighted mean, standard deviation

* Linear regression

* Correlation coefficient

* Linear estimation

* Statistical registers table

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# Reviews

Helpfulness

Newest

Rating

Helpfulness

All Versions

All Versions

Latest Version

3.8

5 total

5 2

4 2

3 0

2 0

1 1

Harold Reed

I was looking for a I was looking for a replacement for my hp10c. The 15c doesn't have the same features, but this app does an excellent job of emulating it. Worth the price.

A Google User

Big recommendation Fabulous! Costs less than new batteries for my HP 32SII and works a treat. Junking my old calculator now!

User reviews

Review deleted

# What's New

Named macros RCL-EEX and STO-EEX support

New layouts (1024x600, Galaxy Nexus, ...)

New i key for direct complex numbers input

Gestures support (swipe and long tap)

Memory registers on Search key

Conversions between values (menu and option)

'Duplicate on ENTER' option

Constants (menu and option)

Display format of the numbers option

Macros for easy programming

Complete statistics functions

Date operations

# Additional information

Updated

June 26, 2012

Size

2.5M

Installs

500 - 1,000

Current Version

1.44

Requires Android

2.1 and up

Content Rating

Everyone

Permissions

Report

Flag as inappropriate Offered By

Laurent Rodier

Developer

Visit Website Email support@lsrodier.net

Laurent Rodier
Via Venezia 18
20054 Nova Milanese (MI)
Italia

# Similar

## Scientific Calculator Pro

RealMax

1

This is a user friendly scientific calculator which can be used for your mathematical tasks.

This has following features

* All Basic Mathematical Operations

* Trigonometric operations

* Hyperbolic operations

* Logarithmic operations

* Complex number operations

* 10 variables

* HEX,DEC,OCT,BIN operations

* Fractions Support

* Degree,Minute,Second Calculations

* Degrees, Radian, Gradient Support

* Solving Linear equations

* Plot Graphs

* Common unit conversions

* Predefined Scientific Constants

Please report any improvements required in future releases to realmaxsoft@gmail.com

-- FAQ --

Is this Calculator Capable of working fractions. Yes. This can be used as fraction calculator. Use ‘ab/c’ button to enter fractions and see help for more information.

How HEX,BIN.DEC,OCT number entered ?. Change Calculator mode to Base with Mode button.

Can this be used as a Graph Calculator? Yes. see help for more information.

How to see calculation history? Use up and down arrow keys to browse calculator history.

## Scientific Calculator PasCal

PasCal for Android is a scientific calculator application which features formula input method.

Calculation formulas can be confirmed while composing and can be revised easily, so it shows a big effect especially in a complicated calculation.

And PasCal can specify variables in a calculation formula which makes the formula versatile and worthful to preserve as a library.

In the simple appearance, PasCal incorporates many functions necessary for natural science and the engineering.

In addition, the Solver and the Graph newly implemented provides the solutions of equations and the capability of plotting the solutions or the arbitrary functions.

If you want to perform a complicated calculation easily or if you want to calculate effectively or if you want to solve differential

equations and so on, PasCal is strongly recommended to you.

Calculation formulas can be confirmed while composing and can be revised easily, so it shows a big effect especially in a complicated calculation.

And PasCal can specify variables in a calculation formula which makes the formula versatile and worthful to preserve as a library.

In the simple appearance, PasCal incorporates many functions necessary for natural science and the engineering.

In addition, the Solver and the Graph newly implemented provides the solutions of equations and the capability of plotting the solutions or the arbitrary functions.

If you want to perform a complicated calculation easily or if you want to calculate effectively or if you want to solve differential

equations and so on, PasCal is strongly recommended to you.

*********************************************************************************

Within 300 installs, newly released PasCal is delivered with a special price.

Please consider purchasing PasCal if possible.

*********************************************************************************

PasCal features

* 5 body color variations

* Formula input method makes it possible to revise a calculation formula easily while composing and makes it easy to recall calculated formula for reusing

* There are Normal mode for general calculations, Complex mode for complex numbers calculations and Logical mode for calculations and bitwise logical operations

* Floating-point decimal,fixed-point decimal, scientific and engineering notation for displaying calculation results in the Normal mode

* Fraction and DMS(Degrees,Minutes,Seconds) calculations and conversions

* Trigonometric functions, hyperbolic functions, square and cubic root functions, natural logarithm, common logarithms and so on functions

* Provides the angle unit of degrees,radians and grads in calculating trigonometric functions

* Complex numbers calculations and function calculus with XY coordinate and Poler coordinate in the Complex mode

* Decimal, hexadecimal, octal and binary radix modes and selectable word length of Byte(8bits), Word(16bits), Dword(32bits), Qword(64bits) in the Logical mode

* Not, and, or, xor, nand, nor and xnor bitwise logical operations and bits rotate and bits shift operations

* The Solver provides the solutions of the 2-4th degree algebraic equations and the simultaneous linear equations of 2-4 unknowns.

And also provides the solution of the differential equations and the results of the numerical differentiation or the integration of arbitrary functions.

* The Graph provides 2D plotting of the built-in functions and the arbitrary functions, so the characteristic of the functions can be comprehended visually.

* One independent memory plus 10 memories

* Memory can be accessed via a dialog

* History of calculation formula and calculation result

* Calculation formulas can contain variables

* Built-in library of calculation formula and user's calculation formula can be registered in the library

* Built-in unit conversions and user definable unit conversions can be added

* Built-in physical constants table and user definable constants table can be added

* Full built-in simple help and full built-in detailed reference manual

## Scientific Calculator

Scientific Calculator - Scientific and Graphing Calculator

This is a fully featured scientific and graphing calculator which supports graph, matrix, complex numbers, equation solver and unit converter. For everyday calculations, the calculator also supports a basic mode.

Features:

* No ads

* Large input/output display

* Dedicated Graph Plotter

* Advanced Unit Converter

* Complex number

* Full Matrix Support up to order of 9x9

* Simultaneous linear equation solver up to 9 variables

* Polynomial equation solver - gives both real and complex solution

* Landscape Mode

* Calculation History

* All Trigonometric operations

* Degree, Radian, Grade

* Binary, Decimal, Octal, Hexadecimal operation

* Bitwise operations

* Ten memory locations

* Results history feature

* Constants Table

* Built-in help (accessible via options menu)

You can also try the free version:

https://play.google.com/store/apps/details?id=com.scientificCalculator

## MagicCalc, Graphing Calculator

MagicCalc is a full functions full screen scientific and programmable graphing calculator for Phones and Tablets. It's composed by : Console window for input/output, and calculus operations. 2D graphic window for 2D functions and 2D parametric functions. 3D graphic window for 3D functions and 3D parametric functions. Program editor for scripting complex operations. You can save and load your programs.

- We don't assume any responsabilities on copies installed outside the appstore.

- We don't assume any responsabilities on copies installed outside the appstore.

## Mobi Calculator PRO

IP

1

Universal, everyday use calculator with scientific features. One of top.

Good for simple and advanced calculations!

Good for simple and advanced calculations!

* Math expressions calculation (developed on RPN-algorithm but no RPN-calculators' kind UI!)

* Percentages (calculation discount, tax, tip and other)

* Radix mode (HEX/BIN/OCT)

* Time calculation (two modes)

* Trigonometric functions. Radians and degrees with DMS feature (Degree-Minute-Second)

* Logarithmic and other functions

* Calculation history and memory

* Digit grouping

* Cool color themes (skins)

* Large buttons

* Easy and very user friendly UI

* Very customizable!

* More features will be added. Stay in touch! :)

In the PRO-version only:

* Ability to store records of the history (up to 1000, FREE - 50)

* Ability to edit expression with up to 5 lines on the screen (FREE - 3)

* Additional themes (Business, Ice Cream Sandwich)

The list will be increased!

ATTENTION!

Sometimes we got emails with complaints that Market doesn’t allow to download a purchased application. It is Market’s problem. You should wait and/or try to restart your device.

Please contact Market support or us if you have any problems with it.

http://facebook.com/mobicalc

http://twitter.com/mobicalc

OLD NAME is Cube Calculator.

Free version is avalible in Google Play.

---

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## Scientific Calculator Pro

PowerCalc Pro is a powerful Android scientific calculator with real look. It is one of the few Android calculators with complex number equations support. Features:

* Real multiline equation view editor with brackets and operator priority support

* Equation syntax and actual bracket highlighting

* All functions with complex argument support

* Component or polar complex entry/view mode

* Equation and result history

* 7 easy to use memories

* Large universal/physical/mathematical/chemical constant table

* Degrees, radians and grads mode for trigonometric functions

* Fixed, scientific and engineering view mode

* Easy to use with real look

Stay tuned! We are preparing new functionalities:

* Unit conversions

* Radix modes

* Help

Found bug? Please contact us to fix it.

You can also try our free version before buy.

## Scientific Calculator Plus

CalcTastic is many powerful calculators in one: A full-featured scientific & statistical calculator with fractions and unit conversions. CalcTastic is also Android's ONLY full-featured programmer's calculator.

Visit our website for high-resolution screenshots. http://www.calctastic.com

What does the full version include that the free version doesn't?

- Fractions

- Full Landscape Support

- 7 Premium Themes (12 total)

- Android's ONLY full-featured Programmer's Calculator

GENERAL

- Algebraic, Sequential or RPN input methods

- Postfix notation

- Expression or Stack Display

- Expression History with 20 records

- Calculator Stack with 50 registers

- Memory with 10 registers

- 12 high-quality themes

- Copy and Paste

- Configurable numeric display (decimal point and digit grouping)

- Intuitive long-click feature removes the need to press SHIFT

- Easier to use than an HP 11C / 15C

SCIENTIFIC

- Fractions and Fraction Calculations

- Convert Decimals to Fractions

- Degree/Minute/Second Conversions

- Standard, Scientific, Engineering and Fixed Decimal Notations

- Configurable Precision from 0 - 12 digits

- Table of 44 Physical Constants

- Over 210 different conversion units across 14 categories

- Trig functions in Degrees, Radians or Grads (w/ hyperbolic equivalents)

- Conversions between Degrees, Radians and Grads

- Natural and Base-10 Logarithms

- Percent and Delta Percentage

- Mod(Remainder), Absolute, Ceiling, Floor and Round operations

STATISTICAL

- Factorial and Gamma Functions

- Combinations and Permutations

- Random Number Generator (random decimal or random in given range)

- 15 Single-Variable Statistics commands operate on all stack entries

- Quantity, Min, Max, Range, Sum, Median

- Arithmetic Mean, Geometric Mean, Mean Squared

- Sum Squared, Sum of Squares of Variance

- Sample Variance, Sample Standard Deviation

- Population Variance, Population Standard Deviation

PROGRAMMER

- Binary, Octal, Decimal and Hexadecimal display and conversions

- 100% support for all common integer-sizes (8, 16, 32 and 64 bit)

- Every integer-size is supported in both SIGNED and UNSIGNED modes

- Calculation History viewable in all four bases

- Conversion casts between any two integer-sizes

- Dedicated binary-bit display for all 64-bits

- Instant access to toggle any binary bit

- Bitwise logic operations AND, OR, XOR, NAND, NOR, XNOR

- Bitwise shift operations (correctly differentiates between SIGNED and UNSIGNED right shifts)

- Roll Left and Right for quick number entry

- 1's and 2's complement. Native interpretation is 2's complement

- Byte and Word flipping (ie LSB and LSW display)

- Random Number Generator (random bits at any integer-size)

## Scientific Calculator EQ7 Pro

The EQ7 is a professional, accurate, full-featured scientific calculator designed for Android devices. It offers the powerful features of a handheld scientific calculator, with an improved interface to enhance user experiences. While designed primarily for mathematicians, engineers, and students, this scientific calculator is accessible to anyone.

Features:

• Large multi-lined display with automatically adjusting font size for long equations

• Morphing keyboard that accommodates user needs

• Equation history

• Store favourite equations

• Display answers as fractions and mixed numerals

• Assign variables and constants

• Switch bases: binary, octal, decimal, and hexadecimal

• Complex numbers

• Conversions

• Trigonometry

• Probability

• Generate random numbers

• Calculus (integration, and differentiation)

• Solving equations (determine the x value which reduces the equation to zero)

• Euclidean and floored division modulus

• Greatest common divisor

• Least common multiple

• Average

• Median

• Series

• Product of a sequence of terms

• Sign (sgn)

• Sexagesimal (degrees, minutes, seconds)

• Polar and rectangular coordinates

• Configurable rounding mode for displayed answers

• Radians, degrees, and gradians

• Normal, scientific, engineering, and fixed notation

• Full help documentation (click the advanced button entitled "help")

## Scientific Calculator Dx(full)

Scientific Calculator Dx is a professional scientific and graphics calculator with many useful features. In addition to the classic functions of a scientific calculator this application is also able to calculate complex mathematical expressions and to design, simplify, solve and find derivatives up to N order and plot functions.

Scientific Calculator Dx can be used also to convert numeric base (hex, bin and dec).

The application also uses the accelerometer (in addition to normal "OK" button) to show the result on the screen (just shake your device).

Many other useful functions will be added soon.

Scientific Calculator Dx can be used also to convert numeric base (hex, bin and dec).

The application also uses the accelerometer (in addition to normal "OK" button) to show the result on the screen (just shake your device).

Many other useful functions will be added soon.

## Calculator

Calculator

A simple, beautiful calculator inspired by the iPhone calculator but with added functionality such as skins and layouts. It is designed to replace the rather lame stock calculator with a calculator that looks great while retaining ease of use and intuitive design. Calculator is designed to meet all of your calculating needs!

***Calculator Features***

*Simple, accurate calculator: Leave the calculator in portrait view to see just a simple calculator, or turn the calculator on its side to reveal a scientific calculator

*Calculator Skins: Calculator v.3.0 now supports changing of skins to change the look and feel of the calculator. Choose between and array of different skins to match your favorite phone OS including iOS, HTC Sense and Samsung Galaxy. Also if there is a certain skin you would like to see made for you, don't hesitate to send an email!

*Different calculator layouts: Choose between 3 different calculator layouts. 1) Default Layout for a standard 10-key calculator in portrait mode and scientific calculator in landscape. 2) Business Layout adds a '%' key in portrait mode and a '00' key. 3) Simple Layout keeps the 10-key calculator in both portrait and landscape mode when all you need is a simple calculator.

*Memory Buttons- Fully functional 'M+', 'M-', 'MR' and 'MC' calculator buttons. Calculator will remember the value stored in it even if you leave the app.

*Landscape calculator: Turn your phone on its side to reveal a scientific calculator with advanced functions like square root, exponents, factorials and more.

*Trig calculator: The landscape calculator even features full support for trigonometric functions. Calculator can take Sin, Cos, Tan, inverse trig, and hyperbolic functions and can calculate in both Radian and degree mode. Great for use in algrebra and other math classes.

*Calculator looks great from the smallest to the largest screens as well as low and high density screens. Calculator also works on the Galaxy Tab!

*App2SD- You can install Calculator to your SD card if using Android 2.2+

Check my website below for a full Calculator changelog.

Any suggestions for improvements or new features for the calculator are greatly appreciated. Just send me an email!

Website: www.stormindorman.com

Twitter: @stormindorman

I hope you enjoy using Calculator!

## NeoCal Advanced Calculator

NeoCal is an advanced, award-winning calculator designed to work just like a real calculator, only better. The intuitive keyboard design provides efficient access to over 230 financial, statistical, scientific, programmer, conversion, and date and time functions without having to access menus or lists of functions. The large 12-digit display includes thousands separators and shows labels for calculated and stored results. Backspace, Undo, and Redo make correcting mistakes simple.

NeoCal is highly customizable to work the way you do. Enable the Precedence option to reduce entering parenthesis, or enable the RPN option to eliminate them completely. Enable up to four display lines to see current and previous results. Choose your own theme for improved readability.

NeoCal is a mature product that has been on the market for eleven years. It has been continually enhanced by suggestions from the user community, making it an even more effective and user-friendly tool. An extensive user guide containing many examples is included in the application.

SUMMARY OF BUILT-IN FUNCTIONS

- Scientific: trigonometric, hyperbolic, and logarithmic functions; degrees/radians conversions; time and angle conversions; physical constants

- Financial: time value of money, amortization; discounted cash flow analysis for internal rate of return and net present value; interest conversion between nominal and effective rates; margin and markup calculations

- Statistical: two variable statistical analysis including mean, weighted mean, standard deviation; linear regression forecasting, correlation coefficient; probability calculations

- Date and Time: date arithmetic; duration arithmetic and conversions including frames for digital video editing; moment conversions

- Programmer: base number conversions between binary, octal, decimal, and hexadecimal; 32-bit, 16-bit, and 8-bit signed and unsigned integer math calculations and conversions; logical and bit-manipulation operations

- Conversion: length, area, volume, speed, weight, temperature; unit arithmetic

SUMMARY OF FEATURES

- UI designed specifically for Android phones and tablets

- Unique Dynamic Keyboard technology

- User-selectable themes

- Multiple keyboard layouts

- 12-digit display with thousands separators

- Locale-based number, date, and time formatting

- Labeled results for clarity

- Optional RPN input method

- Selectable RPN stack size

- Up to four display lines

- 20 or 100 user registers

- Multi-level Undo/Redo

- Macro record and playback

- Extensive user guide included in the app

## RPN Calculator Premium

The Premium version of RPN calculator adds the following features to the standard version:

- New functions to manipulate the stack: Swap (the two bottom lines) and Roll (the whole stack)

- A Space button to put several numbers on the stack with a single Enter

- An Inverse button (useful to correct divisions done with the arguments in bad order)

- No ads

## 15C Scientific Calculator

As a powerful emulator of HP 15C Scientific Calculator, Vicinno 15C Scientific Calculator provides all functions of the world-renowned HP 15C RPN high-end scientific programmable calculator for Android. It uses the identical mathematics and calculations with the original to give you the same precision and accuracy.

It can perform numerical integration and solve the roots of equations in addition to supporting complex numbers and matrix calculations.

**** Cool Tip: click the upper right logo to see the settings page for more options. ****

**** Please be noted: the f (i) in our app works a little differently from the real calculator: instead of hold and release, just click the f (i), the display will show the imaginary part for a second, then switch to real part automatically. *****

★ Features include:

• Root finder

• Numeric integration

• Complex numbers

• Matrix operations

• Hyperbolic and inverse hyperbolic trig functions

• Probability (combinations and permutations)

• Factorial, % change, and absolute value

• Random number generator

• RPN entry

• Programmable

• enable/disable key click sound

• Comma as decimal point option

• Automatically save/restore settings

• Touch logo to see all settings

• Direct access to support forum from app

• Support Android Tablet

• More

★ Support:

Feel free to contact us at support@vicinno.com.

★ Stay tuned:

Like us: www.facebook.com/vicinno

Follow us: www.twitter.com/vicinno

## Classic Calculator FULL

This application has been designed and engineered for easy operation at any level. The Natural Display and enhanced features makes it versatile and the perfect choice for high school and college students alike.

THIS VERSION HAS THE SAME FEATURES BUT NO ADVERTISING

* Multi-skin

* Copy clipboard

* Percentages

* Memories

* Trig functions in degrees, radians or grads

* Fixed-point display modes

* Configurable digit grouping and decimal point

* Degrees, minutes and seconds.

* Adjustable size digit

## WRPN 16c

It uses Reverse Polish Notation (RPN), which uses the ENTER key instead of the "=" (equals) key.

In addition to all the functions you'd expect from an ordinary calculator, WRPN 16c also has many features specifically designed for the computer professional:

• Word sizes from 1-64 bits per word

• Signed math (1's complement, 2's complement, unsigned)

• Logical operators (and, or, xor, not, masks, etc)

• Bit-wise operators (shift, rotate, rotate with carry, etc)

• 32 storage registers

• 4 position stack

• 203 lines of program memory

WRPN 16c is available on other platforms, such as Windows, MacOS, and Linux from the following web site http://www.wrpn.emmet-gray.com

Note: The source code to WRPN 16c is also available!

## Scientific Calculator for FREE

Our scientific calculator is provided to you in full and for free. Do you have difficulty in calculating scientific matter you do not worry use scientific calculator application. This complete calculator is helpful for you as a student to find a precise mathematical results. Can have quick access to certain mathematical functions when needed, so that the right choice for you

Scientific Calculator we have features such as:

* The history with this feature you can see the history of the previous results,

* Memory Features

* Traditional algebraic or RPN operation

* Result history * Unit conversions

* Physical constants table

* Percentage

* Binary, octal, and hexadecimal (can be enabled in Settings)

* Trig functions in degrees, radians or graduate

* Scientific, engineering and fixed-point display modes

* Configurable digit grouping and decimal point, and many others in the full scientific calculator

# More from developer

## Scientific/Financial RPN calc

My RPN calculator is a scientific and financial calculator inspired by the Hewlett-Packard HP-10C series pocket calculators of the 80s, most notably the HP 12C and HP 15C models.

These software version has borrowed the RPN (Reverse Polish Notation) and the look&feel of those calculators. It features classical 4 operations, logarithms, trigonometry, statistics, financial,and macros for easy programming. It also features complete support for complex numbers along with 2nd, 3rd, and 4th degree equations solving.

Its unique magenta L key allows switching from one layout to another, thus saving space on small displays like smartphones without compromising usability.

Support for gestures allows switching from one keyboard to another by swiping left or right, and a light swipe up or down on a key executes the associated f or g function, without any need to actually press the f or g key.

See the web pages of the application at http://calc.lsrodier.net for complete keys description and samples.

My RPN calculator is compatible with all devices running Android 2.1 and up and supports both horizontal and vertical orientations. It does however requires a device with a minimum screen resolution of 320x480 (or 480x320 according to orientation). Note that tablet screens are properly managed.

Summary of the main functions:

* RPN input

* Portrait/landscape and multi-resolution layouts

* Gesture support for extended/simplified inputs

* Arithmetic functions (+, -, x, /, 1/x, +/-, etc)

* Trigonometry, logarithms, hyperbolic trigonometry

* Percentages (+, -, variation, total)

* Dates

* Complete complex numbers support

* 2nd, 3rd, and 4th grade equations solving

* Unit conversions (temperatures, distances, etc)

* Macros for simple programming tasks

Summary of the main statistical functions:

* 1- and 2-variable statistics

* Sums (Σx, Σx2, Σy, Σy2, Σxy)

* Mean, weighted mean, standard deviation

* Linear regression

* Correlation coefficient

* Linear estimation

* Statistical registers table

Summary of the financial functions:

* Simple and compound interests

* Cash flow analysis (NPV, IRR)

* Depreciation (SL, DB, SOYD)

* Financial registers table

## Scientific/Financial RPN DEMO

** DEMO VERSION of My RPN Calc 1.61 **

My RPN calculator is a scientific and financial calculator inspired by the Hewlett-Packard HP-10C series pocket calculators of the 80s, most notably the HP 12C and HP 15C models.

These software version has borrowed the RPN (Reverse Polish Notation) and the look&feel of those calculators. It features classical 4 operations, logarithms, trigonometry, statistics, financial,and macros for easy programming. It also features complete support for complex numbers along with 2nd, 3rd, and 4th degree equations solving.

Its unique magenta L key allows switching from one layout to another, thus saving space on small displays like smartphones without compromising usability.

Support for gestures allows switching from one keyboard to another by swiping left or right, and a light swipe up or down on a key executes the associated f or g function, without any need to actually press the f or g key.

See the web pages of the application at http://calc.lsrodier.net for complete keys description and samples.

My RPN calculator is compatible with all devices running Android 2.1 and up and supports both horizontal and vertical orientations. It does however requires a device with a minimum screen resolution of 320x480 (or 480x320 according to orientation). Note that tablet screens 1280x800 and 1024x600 are properly managed.

Summary of the main functions:

* RPN input

* Portrait/landscape and multi-resolution layouts

* Gesture support for extended/simplified inputs

* Arithmetic functions (+, -, x, /, 1/x, +/-, etc)

* Trigonometry, logarithms, hyperbolic trigonometry

* Percentages (+, -, variation, total)

* Dates

* Complete complex numbers support

* 2nd, 3rd, and 4th grade equations solving

* Unit conversions (temperatures, distances, etc)

* Macros (up to 10 programs) for simple programming tasks

Summary of the main statistical functions:

* 1- and 2-variable statistics

* Sums (Σx, Σx2, Σy, Σy2, Σxy)

* Mean, weighted mean, standard deviation

* Linear regression

* Correlation coefficient

* Linear estimation

Summary of the financial functions:

* Simple and compound interests

* Cash flow analysis (NPV, IRR)

* Depreciation (SL, DB, SOYD)

## Cyclodraw drawing toy

Cyclodraw is a mandala geometrical drawing application. It mostly produces mathematical curves technically known as hypotrochoids and epitrochoids, along with gears, ellipses and rectangles. Curves can be layed together to produce fantastic drawings. The application has been designed for creativity (especially children creativity) without any mathematical knowledge ever required.

## Voice Office/Kids calculator

VOCal is a classical office calculator with a virtual tape to print all operations. When operating in children mode, the additions, substractions and multiplications are presented in columns as children are used to compute. The optional voice option turns on/off the reading or spelling of the numbers and operations.

Common features:

* Common math operations (+, -, x, /, %, inv)

* One memory register

* Virtual tape presenting all executing operations

* Landscape/portrait layouts

* Left/right-handed landscape layouts

* Haptic feedback (optional)

Virtual tape features:

* Printing of executed operations

* Double press the C key to clear the tape

* Kid mode to print base operations using school layout

* Colored for easy reading

Voice features:

* May be turned on/off

* All keys are spelled

* All results are either spelled/read (option)

* Long tap a virtual tape line to read/spell the operation

See http://vocal.lsrodier.net for further details.

## Financial RPN calculator

My RPN calculator is a scientific and financial calculator inspired by the Hewlett-Packard HP-10C series pocket calculators of the 80s, most notably the HP 12C and HP 11C models.

These software version has borrowed the RPN (Reverse Polish Notation) and the look&feel of those calculators. It features classical 4 operations, logarithms, statistics, financial,and macros for easy programming.

Its unique magenta L key allows switching from one layout to another, thus saving space on small displays like smartphones without compromising usability.

Support for gestures allows switching from one keyboard to another by swiping left or right, and a light swipe up or down on a key executes the associated f or g function, without any need to actually press the f or g key.

See the web pages of the application at http://calc.lsrodier.net for complete keys description and samples.

My RPN calculator is compatible with all devices running Android 2.1 and up and supports both horizontal and vertical orientations. It does however requires a device with a minimum screen resolution of 320x480 (or 480x320 according to orientation). Note that tablet screens 1280x800 are properly managed.

Summary of the main functions:

* RPN input

* Portrait/landscape and multi-resolution layouts

* Gesture support for extended/simplified inputs

* Arithmetic functions (+, -, x, /, 1/x, +/-, etc)

* Logarithms

* Percentages (+, -, variation, total)

* Dates

* Unit conversions (temperatures, distances, etc)

* Macros for simple programming tasks

Summary of the main statistical functions:

* 1- and 2-variable statistics

* Sums (Σx, Σx2, Σy, Σy2, Σxy)

* Mean, weighted mean, standard deviation

* Linear regression

* Correlation coefficient

* Linear estimation

* Statistical registers table

Summary of the financial functions:

* Simple and compound interests

* Cash flow analysis (NPV, IRR)

* Depreciation (SL, DB, SOYD)

* Financial registers table

## Thank You!

A most "useful" application displaying Thank You. A good match to the classical Hello World application though this one tries to display the Thank You text in as big letters as possible.

Did I mention it actually displays Merci on French devices and Grazie on Italian ones ? Definitly the "must have" application in the category of the useless ones !

## My talking calculator

The Clouseau Calc is a talking 4-operations calculator with a strong French accent. As a calculator it is useful by itself as it offers the common operations found on small calculators (+, -, /, x, %, 1/x) along with a single memory register. It is however unique when the voice option is turned on (default), as it also speaks, reading/spelling the computed values or describing the executed functions, not to mention the "Oh la la" mode.

See the web site pages at http://clouseau.lsrodier.net for a complete listing of the vocabulary and available idioms and accents.

Clouseau Calc is compatible with all devices running Android 2.1 and up and supports both horizontal and vertical orientations.

## 5x7 LED chronometer

A simple yet effective 5x7 led chronometer as we usually see around sport arenas. It features typical options like pause, stop, resume, restart, and markers.

See the web pages of the application for complete description.

5x7 LED chronometer is compatible with all devices running Android 2.1 and up, and supports both horizontal and vertical orientations.

## Bbuzz, basketball buzzer

Bbuzz, Basketball buzzer, is a 5x7 LED countdown chronometer as we usually see around sport arenas, especially with basketball games. When it reaches zero, it plays a buzzer sound. Both the countdown time and the buzzer may be tuned through the options dialog.

A typical usage is basketball, where one touchs the screen whenever the ball is in play or the referee whistles, and the player icon is pressed when the ball changes hand. Bbuzz also supports the 14s rule when a foul is made less than 14 seconds before the end of the 24 seconds.

Bbuzz is compatible with all devices running Android 2.1 and up and supports both horizontal and vertical orientations.