Scientific RPN calculator

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# 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

## 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

## Free42

Free42 is a re-implementation of the HP-42S calculator and the HP-82240 printer.

It is a complete rewrite, not using any HP code, and it does not require an HP-42S ROM image.

Free42 is an Open Source project. The executables and source code are released under the terms of the GNU General Public License, version 2.

All third-party code used in Free42 is either in the public domain, or licensed under terms compatible with GPLv2, or used with the authors' permission.

It is a complete rewrite, not using any HP code, and it does not require an HP-42S ROM image.

Free42 is an Open Source project. The executables and source code are released under the terms of the GNU General Public License, version 2.

All third-party code used in Free42 is either in the public domain, or licensed under terms compatible with GPLv2, or used with the authors' permission.

## Panecal Plus

Appsys

1

Panecal is a scientific calculator application for technical work such as information engineering, mechanical engineering, dynamics, measurements, and construction, an essential item for engineers and science students.

Panecal is a scientific calculator that can display and correct mathematical formulas. You can use it to check formulas, which enables you to prevent input errors and calculation mistakes. Panecal has functions such as editing and recalculating calculation formulas entered in the past, as well as the capability to use variable memory to only change specific values and do calculations.

A cursor is displayed on the screen, and you can tap the screen or push arrow keys to quickly move to the location you want to edit. Panecal allow you to swipe to scroll through formulas, as well as copying and pasting using long tapping, which makes it a strong and flexible application with an intuitive user interface.

[Main functions]

- Move the cursor by tapping and swipe to scroll through the screen

- Copy and paste

- Can select from a history list of formulas calculated in the past, edit them, and recalculate

- Can calculate binary numbers, octal numbers, decimal numbers, hexadecimal numbers up to 32 bits, and do radix conversion

- Can use M+/M- memory functions and 6 types (A-F) of variable memory

- Arithmetic operations, inverse trigonometric functions, logarithmic functions, power functions, power root functions, factorials, absolute values, and percent calculations

- Can select degrees, radians, or grads for angle units

- Can select from FloatPt (floating decimal mode), Fix (fixed decimal mode), Sci (index mode), and Eng (index is in multiples of 3) for displaying values

- Can set types of decimals and grouping separator settings

- Horizontal screen display

- Check key input with vibration and orange coloring

Panecal is a scientific calculator that can display and correct mathematical formulas. You can use it to check formulas, which enables you to prevent input errors and calculation mistakes. Panecal has functions such as editing and recalculating calculation formulas entered in the past, as well as the capability to use variable memory to only change specific values and do calculations.

A cursor is displayed on the screen, and you can tap the screen or push arrow keys to quickly move to the location you want to edit. Panecal allow you to swipe to scroll through formulas, as well as copying and pasting using long tapping, which makes it a strong and flexible application with an intuitive user interface.

[Main functions]

- Move the cursor by tapping and swipe to scroll through the screen

- Copy and paste

- Can select from a history list of formulas calculated in the past, edit them, and recalculate

- Can calculate binary numbers, octal numbers, decimal numbers, hexadecimal numbers up to 32 bits, and do radix conversion

- Can use M+/M- memory functions and 6 types (A-F) of variable memory

- Arithmetic operations, inverse trigonometric functions, logarithmic functions, power functions, power root functions, factorials, absolute values, and percent calculations

- Can select degrees, radians, or grads for angle units

- Can select from FloatPt (floating decimal mode), Fix (fixed decimal mode), Sci (index mode), and Eng (index is in multiples of 3) for displaying values

- Can set types of decimals and grouping separator settings

- Horizontal screen display

- Check key input with vibration and orange coloring

[Disclaimer]

Please note in advance that Appsys is not responsible for any damage or lost profits caused by the use of this software, or any claims from third parties.

## 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

## Scientific Calculator (adfree)

TechCalc+ contains 12 computing modes in one application + a handy reference section.

Modes included are:

Modes included are:

* Basic Mode,

* Scientific Mode,

* 64-bit Programmer Mode (Hex, Oct, Bin and Dec),

* Graphing (save copy of graph to sdcard),

* Matrices,

* Complex Numbers (cartesian, polar, using Euler's identity),

* Quick Formulas,

* Quick Converter,

* Time Calculator,

* Equation Solver,

* Calculus (Derivative, Definite Integral, Taylor Series & Indefinite Integral) - requires Android version 2.3 or higher

* Financial

+ the Periodic Table of Elements!

Features include:

* All Trigonometric operations (radians, degrees or gradients)

* Powers & Roots

* Logs and Antilogs

* Factorial, Modulus & Random Numbers functions

* HCF, LCM, Prime factorization

* Pol() & Rec() Functions

* Permutations (nPr) and Combinations (nCr)

* Statistics

* Fractions Mode

* A wide range of conversion categories and constants

* 20 Memory Registers in each of the calculation modes

* Detailed calculation history

* Extensive Help and Reference

* Highly customizable via the Settings

The reference section includes:

* Physical Laws

* Names in the Metric System

* Mathematical Tables

* Elementary & Linear Algebra

* Trigonometric Identities

* Differentiation & Integration Rules

* Statistics Formulas

* Vector Mathematics

* ASCII, Fractional Bits & Roman Numeral Converters

* pH, Interpolation, Body Mass Index (BMI) & Proportion Calculators

* Sigma & Pi Notation

Please email any questions that are not answered in the Help section.

## HP-35 Emulator Calculator.

The HP-35 was the first scientific pocket calculator in the world (with exponential and trigonometric functions). Also used Reverse Polish Notation (RPN), being the first scientific calculator algebraic history.

And now through this emulator for the HP-35, where both perfectly emulates the LED screen of the original 15-digit calculator physically and how we can make use of it in a virtual like you're actually physically in our hands through our Android device.

The HP-35 calculated arithmetic functions, logarithmic and trigonometric functions.

And now through this emulator for the HP-35, where both perfectly emulates the LED screen of the original 15-digit calculator physically and how we can make use of it in a virtual like you're actually physically in our hands through our Android device.

The HP-35 calculated arithmetic functions, logarithmic and trigonometric functions.

Some historical curiosities of this calculator are:

- The display of 15 characters in the HP 35, when the reverse was seen, could produce a limited number of alphabetic messages. For example, 710.77345 would read as "SHELL OIL". The sample was probably more extravagant +40 57738.57734 E would be read as "Oh Hells Bells".

- The HP 35 was just 5.8 inches long and 3.2 inches wide. This was the pocket size of William Hewlett, of there as the "pocket calculator".

- The power requirement of the LED display was responsible for the short life between battery charges the HP 35, about three hours. To prolong the operating time and prevent damage from overuse of the slide switch on / off, users could press the decimal point key to force the display to illuminate only a segment of the LED.

- The HP 35 calculated arithmetic functions, logarithmic, and trigonometric, however, full implementation used only 767 carefully chosen instructions (7670 bits), in what is a marvel of concise programming.

- The introduction of the HP 35 scientific calculators and other similar capacity by Texas Instruments soon signaled the end of the slide rule as a status symbol among science and engineering students. The covers of the rules of calculations were disappearing to make way for the covers of the "electronic slide rule", and universities began to abandon the slide rule classes of their curriculum.

- The HP 35 was the beginning of a family of related calculators all sharing similar mechanical packaging:

- The screen was unique in the sense that multiplexing is designed to illuminate only one LED at a time segment, instead of a single-digit LED, because HP investigations had shown that this method was perceived by the human eye as more Bright energy equivalent.

- The calculator used three NiCd batteries "AA" assembled in a removable battery pack, owner of HP design. Battery packs and replacement are unavailable, leaving 35 HP depending existing alternating current, or the users must rebuild the battery pack using batteries themselves available. An external battery charger was available and could also function calculator from charger, with or without batteries installed.

Internally, the calculator was organized around a serial processor chipset (a bit) floating point number processing 56-bit, 14-digit numbers representing BCD.

It was introduced at a price of U.S. $ 395.1 and was available from January 4, 1972 to 1975. During that time over 300,000 units sold.

Before the HP 35, the only practical portable devices to perform trigonometric and exponential functions were slide rules. At that time, existing pocket calculators had only four functions, ie could only add, subtract, multiply and divide. Originally it had been known simply as "The Calculator", but Hewlett suggested that it should be called the HP 35 because it had 35 keys.

HP 35 was developed in two years, HP 35 was released in 1972.

## HiPER Calc Pro

Scientific calculator with arbitrary precision. Its features are:

- compact view for smartphones

- expanded view for tablets

- pocket view for small devices

- up to a hundred decimal places and 9 digits of exponent

- landscape and portrait mode (compact view)

- basic arithmetic operations including percentage, modulo, negation

- mixed and improper fractions

- periodic numbers and their conversion to fractions

- unlimited number of braces

- operator priority

- repeated operations

- advanced number operation such as random numbers, combinations, permutations, common greatest divisor, ...

- goniometric and hyperbolic functions

- powers, roots, logarithms, ...

- degrees, minutes and seconds conversion

- fixed point, scientific and engineering display format

- display exponent as SI units prefix

- memory operations with 10 extended memories

- clipboard operations

- result history

- binary, octal and hexadecimal numeral systems

- logical operations and bitwise shifts

- haptic feedback

- compact view for smartphones

- expanded view for tablets

- pocket view for small devices

- up to a hundred decimal places and 9 digits of exponent

- landscape and portrait mode (compact view)

- basic arithmetic operations including percentage, modulo, negation

- mixed and improper fractions

- periodic numbers and their conversion to fractions

- unlimited number of braces

- operator priority

- repeated operations

- advanced number operation such as random numbers, combinations, permutations, common greatest divisor, ...

- goniometric and hyperbolic functions

- powers, roots, logarithms, ...

- degrees, minutes and seconds conversion

- fixed point, scientific and engineering display format

- display exponent as SI units prefix

- memory operations with 10 extended memories

- clipboard operations

- result history

- binary, octal and hexadecimal numeral systems

- logical operations and bitwise shifts

- haptic feedback

Calculator has many settings to manage display numbers precision, full screen mode, decimal and thousand separators etc.

## Scientific Calculator Pro

mamuso

1

This is the Pro version of Scientific Calculator CalcAndroid.

It is the same that the free version, except for:

It is the same that the free version, except for:

* No ads! More space for your chubby fingers!

* You help mamuso to keep on developing!

* You will be a 15.4% happier, for the price of a coffee!

-----

CalcAndroid - Scientific calculator.

Looks, works and feels like the old ones.

Features:

* 10 digits display + 2 digit exponent ( range from -9.9e99 to 9.9e99 )

* Typical operations ( add, subtract, multiply, divide ), with virtually infinite brackets

* Power functions ( n-power, n-root, square, square root, cubic root )

* Logarithmic functions ( log10, ln, 10 power, exp )

* Single value memory

* Trigonometric functions ( sin, cos, tan, including inverse and hyperbolic )

* Three angle modes ( deg, rad, gra )

* Random number generator

* PI constant

* Permutation (nPr) and combinatorial number (nCr)

Please tell me your thoughts at www.mamuso.com

## powerOne Scientific Calculator

powerOne® combines an algebraic and RPN calculator with simple, customizable, spreadsheet-like templates, giving you hundreds to choose from. Create your own and share with others.

powerOne calculators have been:

● "The créme de la créme of calculators" - AppAdvice

● "Incredibly powerful tool for calculations of all kinds." - Smokin' Apps

● "You need this calculator. It's miles better than the competition." - Robert Burns

● "…sets the benchmark for other calculators to reach." - Fred Swan

● "Not sure how I could do my job without powerOne." - Arvid Martin

● "A legend. The best calculator app I have ever seen." - Worldwide Tech

● "… powerOne shines." - Mac Observer

CALCULATE

Whether math and science, conversions, engineering, construction, finance, investing or real estate, powerOne has you covered. There are hundreds of spreadsheet-like calculator templates pre-installed or in the Library, ready right now for all kinds of what-if scenario analysis.

And for those one-off calculations use powerOne's elegant algebraic and RPN calculator. Perform calculations in either decimal, scientific, engineering, fraction or feet-inch format with functions that include powers, logs, trig and more.

CREATE

powerOne is easily customized. It includes a dynamic language to create your own calculator templates. It can be as easy as entering a formula similar to HP Solve or harness the complete capabilities of powerOne's simple scripting language. Hundreds of examples and instructions included.

SHARE

Whether colleague or client, powerOne makes it easy to share the results and created templates, too. Just choose who to send it to. The results are in the email and so is the template. Click the attached template and it will load right into powerOne.

TRUST

After 15 years and close to 20 million software calculators distributed, Infinity Softworks has earned its reputation for high quality apps. We'd love to hear from you, whether ideas, help or problems, at help@infinitysw.com.

------------------------

This version of powerOne includes…

* Full-featured algebraic and RPN calculator

* Pre-installed calculator templates:

- Area Conversion

- Areas

- Energy Conversion

- Force Conversion

- Length Conversion

- Mass Conversion

- Power Conversion

- Pressure Conversion

- Probability

- Pythagorean Theorem

- Statistics, One-Variable

- Statistics, Two-Variable

- Temperature Conversion

- Velocity Conversion

- Volume Conversion

- Volumes

* Access to hundreds of additional templates in the Library

* Create your own templates

* Perform decimal, fraction or feet-inch math with hundreds of functions ranging from powers and trig to programmer's math and matrices

* Share results and templates by simply entering a recipient

## 15C Scientific Calculator Free

It is a demo version of Vicinno 15C Scientific Calculator. It demonstrates how Vicinno 15C works on various Android devices. The functionality of the demo version is limited since both f and g keys are disabled. If you are interested in its pro version, please search for "Vicinno" on Google Play.

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

## MC50 Scientific Calculator

Features of MasterCalc MC50:

All the features of the free version (MasterCalc MC40), are included in this model.

For more information please see the application MasterCalc MC40.

You can import formulas, user-defined functions and constants stored in the model MC40.

Currently the differences between the two calculators are:

-No Advertisements.

-Store more than 3 user defined functions.

-Multiple Expressions: Run several expressions and process repetitive calculations automatically.

-There will be new exclusive features in this model.

## 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

* Matrix 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.

## Calc+ Scientific Calculator

Calc+ is a beautiful, universal and innovative scientific calculator, which makes complex calculations much easier.

Features:

✔ Classic algebraic/arithmetic operations

✔ Advanced scientific operations

✔ Memory functions like an original calculator

✔ Percentages

✔ Division with remainder

✔ Conversion of Decimal, Binary, Octal and Hexadecimal numbers

✔ Trigonometric functions (in degrees, radians and grads)

✔ Random number functions

✔ Fullscreen mode

✔ Easy to handle, just like a real scientific calculator

✔ Vibration feedback

✔ App size is really small

One of the best and cheapest scientific calculator apps in Play Store! Just download and be amazed by the simplicity and functionality of this great app.

## 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.

---

KW: mobicalc, mobi, calc, cubecalc, android calculator, percentage, percent, scientific calculator, science, advanced, sine, simple, best, kalkulator, algebra, basic

## Mathex Scientific Calculator

Mathex Scientific Calculator

Fully featured, expression based, scientific calculator which looks and operates like a real one.

Mathex includes the following features:

* Direct algebraic logic: enter equations as they are written

* History Playback: Recall any of the 10 last steps you have made

* Expression (re)editing: change equations and recalculate

* Chain calculations: use answer in following equation

* 2-Line display: check your equation and answer at the same time

* Intuitive Plotting feature

* Symbolic derivative

* Metric conversions

* Physical constants table

* 10 numerical memories

* Percentages calculations

* Combinatorial operators

* Trigonometry functions in degrees, radians or grads

* Normal, Fixed, Scientific or Engineering display modes

* Thin space digit grouping (SI/ISO 31-0 standard)

* Random number generator/White Noise for functions

* Sturdy, stylish look

To request support visit:

https://docs.google.com/spreadsheet/viewform?formkey=dDhzQkFuUWlLT0Y2TXkxVDV4d3QtM3c6MQ

# More from developer

## 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.

## 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)

## 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.

## 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 !

## 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

## 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.

## 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