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

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

## 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.

## CustomCalc Pro Scientific Calc

CustomCalc is a unique, fully customizable calculator app that allows you to add all your most used functions at the swipe of a screen. A totally customizable Financial and Scientific calculator app like no other!

CustomCalc has a very user friendly interface so just about anyone can customize this financial and scientific calculator app. Select RPN mode if you like HP RPN, or select Algebraic mode with a unique intelligent parenthesis button, complementing an outstanding array of built-in functions and features. Redefine the whole keyboard to customize it in pretty much any way desired. Qualified by customers as the best replacement for HP's scientific and financial calculators (HP12C and HP48) and the best alternative to RealCalc scientific calculator.

Execute your common unit conversion in just one touch (also for currency conversion).

It offers in addition to powerful financial, business, currency conversion, trigonometric, scientific (real and complex), statistical, unit conversion, and date and time calculation.

- Automatic Worksheets

- RPN or Algebraic mode

- Memory registers table, easy but powerful, for number storage.

- Improved dimensional number format for currency, time, date, percent, degrees, units (length, area, etc.)

CustomCalc is designed by Visacsoft, software developers that started with Palm operating systems more than 11 years ago.

- Assign any function to any button to execute it in one touch! without browsing for it (including unit conversion)

- Financial Functions (PV, FV, PMT, interest converter, NPV, IRR, etc)

- Business Functions (+Tax, -Tax, Delta %, etc)

- Currency Exchange (assign any currency to any button, store your exchange rate manually or online update all)

- Scientific Functions (all log and exponential functions, all trigonometric functions, etc)

- Date and Time Functions (add days, subtract days, Day of Week, to hour, min, & sec, to hr decimal, etc)

- Unit Conversion functions, assign any button with any unit (Length, Area, Volume, Mass, Force/Weight, Pressure, Temperature, Power, Speed, Energy/Work) and execute it in one touch.

- Statistical Functions (With two variables, Mean, Sum, Standard Deviation, Weighted Mean, 6 Curve Regressions)

- Automatic Worksheets (TVM, Cash Flow, Bond, Interest Converter, Break Even Point, Currency Exchange, Statistical, Data Edit)

- Complex numbers for scientific and trigonometric functions.

- HEX/BIN/OCT base numbers and bitwise functions AND, OR, XOR, NOT, Shift Left, and Shift Right

## 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.

## 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

## RPN Calculator

Easy-to-use calculator for simple mathematical operations using powerful Reverse Polish Notation (RPN), like HP calculators as HP-48 series or HP-12C.

This app is ad-supported (that's the only purpose for which network access permission is used). If you prefer, a Premium version is also available with some additional buttons, no ads and no network access permission necessary.

Instructions

=========

The stack

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

When you type a number and press Enter, the number is stored in the lowest position of the stack, marked by 1:

If you type another number and press Enter, the second number takes the lowest position, and the first number is pushed to position 2: (if you just press Enter without typing a new number, the first number is duplicated).

You can store up to 50 numbers in the stack, even though the screen only shows the numbers on the 4 lowest positions (1: to 4:)

If you press the Down arrow, the number in the lowest position in the stack is erased, and the others are popped one position down.

Press C to cancel the number while you are typing. Press C again to clear the stack.

Mathematical operations

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

If you press one of the mathematical symbols (+,-,x,÷), the corresponding operation is executed using as operands the two numbers in the lowest positions of the stack.

If you press one of the mathematical symbols while typing a number, the operation is executed between the number in the lowest position of the stack and the number that you are currently typing.

The ± key will change the sign of the number that you are currently typing or that of the number in the lowest position of the stack otherwise.

Example

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

If you want to compute the operation 2 x (8 - 5) do as follows:

- Type 8 and Enter

- Type 5 (followed optionally by Enter) and -

(You can also sum -5 doing: 5, ±, +)

- The lowest position of the stack shows the partial result (3)

- Type 2 and x (or 2, Enter, x)

- The final result (6) is shown on the bottom of the stack

## DeepStack RPN Calculator

kssfilo

1

Lightweight Optimized HP Style Reverse Polish Notation(RPN) Calculator.

Features:

Optimized Key Layout

- No algebraic mode!

- Big Enter and Zero Key

- No Triangle Functions or 2nd Function key.

- Conditional DUP/DROP key

- Right hand optimized design

- Inverting layout for left hand using(Optional)

- Stack Label(Optional)

- Auto Sum(Optional)

- Shake to Reset(Optional)

Infinite Stack

- Deep stack without limitation except memory capacity.

- Stateless Design, Reset all condition when launching.

Responsive Touch

- Simple UI response is quicker than rich UI or HP emulators.

## 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!

## MacroDroid - Device Automation

ArloSoft

1

NOW WITH ANDROID WEAR SUPPORT

MacroDroid is a task automation and configuration app that focuses heavily on usability with a simple UI and logical step by step process.

From AndroidTapp.com: "MacroDroid is an utterly brilliant, and less expensive, alternative (to Tasker) that is definitely worth trying out" (4.6/5)

Please note MacroDroid is currently available in English, Spanish, German, French, Italian, Portugese, Polish.and Turkish

A few examples of what MacroDroid can automate:

• Shake the device to upload the last photo to Facebook.

• Turn on Wifi or Data connection when you launch a particular app (and off again when closed).

• Respond to an incoming SMS by sending your current location.

• Toggle the power button to tell you the time (e.g. when its in your pocket).

• Use NFC tags to configure the device (turn on bluetooth, set volume etc).

Creating a custom Macro is easy:

• Click 'Add Macro'

• Select a trigger from a list - (e.g. Battery Level).

• Configure any trigger specific settings - (e.g. Battery Level < 10%)

• Select an action from a list - (e.g Enable/Disable Wifi)

• Configure any action specific setting - (e.g. Disable Wifi)

• Add more actions as required (up to 10)

• Optionally select a constraint from a list - (e.g. Day of the Week)

• Configure constraint as required (e.g. Saturday and Sunday)

• Add more constraints as required (up to 10).

• Choose a name and category for the Macro.

MacroDroid includes a list of template Macros to demonstrate the power and flexibility of the application. These templates can be used as is, or customised to meet your needs.

A subset of the MacroDroid features are listed below:

Over 45 Different Triggers including:

Airplane Mode Enabled/Disabled, App Installed/Removed, App Opened/Closed, Battery Level, Bluetooth Event, Day/Time, Device Boot, Device Docked/Undocked, Dial Phone Number, Headphones Inserted/Removed, Location Trigger, Media Button Press, Mobile Service Status, NFC Tag, Power Button Toggle, Power Connected/Removed, Regular Interval, Screen On/Off, Shake Device, SMS Received, SMS Sent, Widget Button Press, Wifi State Change.

Over 70 Different Actions including:

Auto Answer Call, Control Media, Display Notification, Delete SMS, Enable/Disable Bluetooth & Connect to Audio Device, Enable/Disable Auto Rotate, Enable/Disable Auto Sync, Enable/Disable Data, Enabled/Disable GPS (*), Enable/Disable Wifi, Enable/Disable Wifi Hotspot, Forward SMS, Kill Application, Launch Application, Make Call, Open Website, Play Sound, Popup Message, Reboot/Power Off, Record Microphone, Say Current Time, Send SMS, Set Brightness, Set Airplane Mode, Set Keyguard, Set MacroDroid Mode, Set Ringtone, Set Screen Timeout, Set Volume, Set Wallpaper, Share Location, Sleep Before Next Action, Speak Text, Take Picture, Upload Last Photo, Vibrate

Over 25 Different Constraints including:

Battery Level, Bluetooth State, Call State, Day of the Week, External Power, Headphone Connection, MacroDroid Mode, Phone Ringing, Ringer Volume, Running Application, Screen On/Off, Time of Day, Wifi State

==========

Pro Version

==========

The free version of MacroDroid is limited to five macros and a single action and constraint per macro. You can upgrade in the application to allow unlimited macros with multiple actions and constraints.

=======

Support

=======

We make every effort to test on as many devices as possible, but unfortunately we can't try them all. If you have any problems or issues please contact us at support@macrodroid.com with as much information as possible (including device and OS version). We will always try and resolve any reported bugs ASAP.

If you have any feature requests or suggestions for improvements then please let us know. We plan to support and update MacroDroid long in to the future.

## a Enter b RPN Calculator

This calculator is an RPN calculator with a stack of 128 lines.

What makes this calculator not common is the binary window.

First of all, as you can see the screen, each line of the stack contains 3 elements: decimal, hexadecimal and binary

So for instance, you can enter an hex number, “BF32” and then click on enter to put it in the stack. Each element is updated in real time.

If you want to enter it in binary format, Click on “Next”, and you have the functions for binary operations, then “BIN” button, “Prev” for previous keyboard and now the keyboard is only in binary mode/input.

Click on Next and you can perform binary operations, like for instance “OR” or “NOT”.

“Home” goes back to the main window. Then, you have the standard operators like “+”, “-“, “*” and “/” and also functions to manage the stack.

It is also possible to add comments which could be anything like for instance the unit of the result

The Logarithm Keyboard has all the standard “power” functions.

The Trigonometry Keyboard with true values of PI. For instance, Arc Sin of 1 has Pi/2 as a result. And if you need the value of ‘Pi/2’, just click on “value Pi” and the value in Degree gives 90. You can of course make the calculation in rad or degree.

I hope you will enjoy all the functionality of our high performing calculator.

Thank you.

## HP21 scientific RPN calculator

The HP-21 was a scientific calculator produced by Hewlett-Packard between 1975 and 1978. It was designed as a replacement for the HP-35, and was the first from so called Second Generation Handheld Calculators.

As with most HP calculators then and now, the HP-21 used RPN entry logic, with a four-level stack. It also had a single user-accessible memory register. A shift key provided access to functions whose legends were printed on the fronts of the tall trapezoidal keys.

To enhance practical usability, display was modified to show both X and Y register. Also I have eliminated mechanical DEG/RAD switch and moved the function under DSP button.

HP21 has few big enough buttons to be used comfortably on mobile devices.

## Simple RPN Calulator

This is a simple calculator for the UPN principle (Reverse Polish Notation) works. Inspired by the many products from Hewlett-Packard for this area.

Some features:

- It has all the basic arithmetic operations and can also squares and calculates root

- The stack comprises four levels and is always visible

- Automatic switching between German and English, depending on the setting of the device

- Import and export values via the clipboard

- Landscape mode

- Accuracy of ~15 digits

- Ad-free

Some features:

- It has all the basic arithmetic operations and can also squares and calculates root

- The stack comprises four levels and is always visible

- Automatic switching between German and English, depending on the setting of the device

- Import and export values via the clipboard

- Landscape mode

- Accuracy of ~15 digits

- Ad-free

## Calcularis Scientific Calc

Calcularis: The only scientific calculator you will ever need.

A history feature will allow you to save as many equations as you need and allow you to retrieve them when needed or edit them. No need to press the = button because Calcularis is always calculating.

The full equation with multiple lines makes it easy to keep track of what your are calculating. All the standard scientific functions are on visible keys. There is a scientific and engineering notation mode as well.

Simply the the best free scientific calculator on the market.

The paid mode has the following additional features:

* applications such as Tip and split calculator, Loan calculator, math equations like quadratic equation.

* large set of constants

* unit conversions

* more functions accessed from the FN button

* more key layouts such as a 10 Key and Programmer/logical calculator accessed from the KEYS button

During the trial period (two weeks), you can use the features of the paid mode to try them out. After the trial period, the main features of the calculator will continue to work and will remain free.

Move over RealCalc, the new #1 Android scientific calculator has arrived. Some have asked the question whether you still need your TI, HP, Casio or Sharp calculators. The answer is yes. Phones are not usually allowed in the classroom or in testing centers. You will always need your old calculator for that. Plus calculators like TI-83, TI-84, TI-89 and TI-Nspire include graphing capability that is not currently supported.

# More from developer

## 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.

## 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.

## 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

## 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.