# Description

Much more than a scientific calculator.

A Computing Environment useful for solving many complex problems.

A Matlab / Octave clone for Android.

Java based and open source.

Free and Ad free.

Has most needed math capabilities.

A lot of function included already.

Can parse and run .m files. (try "edit /sdcard/test.m")

Working on bugs and compatibility.

Basic plotting working (you need the app called AddiPlot).

Custom keyboard for entering commands faster.

http://addi.googlecode.com

A Computing Environment useful for solving many complex problems.

A Matlab / Octave clone for Android.

Java based and open source.

Free and Ad free.

Has most needed math capabilities.

A lot of function included already.

Can parse and run .m files. (try "edit /sdcard/test.m")

Working on bugs and compatibility.

Basic plotting working (you need the app called AddiPlot).

Custom keyboard for entering commands faster.

http://addi.googlecode.com

Now have Octave built for Android, moving this soon to a separate app called "octave" (clever...I know). You can go checkout the first version soon. Addi will be going back to being solely java based and small and not very feature rich, while octave will be the real deal, but much larger.

Matlab is a registered trademark or Math Works.

You must install this app before submitting a review.

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# Reviews

Helpfulness

Newest

Rating

Helpfulness

All Versions

All Versions

Latest Version

4.4

609 total

5 400

4 124

3 42

2 13

1 29

A Google User

Do serious math on your mobile A must have for advanced numerical computing and visualization (with addiplot), faaaar more powerful than a number of apps you pay for. Works all right on my samsung galaxy note, even advanced octave commands are present. Wonderful! Excelent work.

A Google User

Better than Octave Addi puts Octave to shame. I had to do some work on my PC using Octave and it snagged on the ! operator, and doesn't show command suggestions like Addi does. This makes me love my Asus Slider all the more.

Rob Ryan

So far, so not good Not helpful. Entering a=[1 2 1;2 3 1;3 3 3];b=[3;7;8];a\b yields "ERROR: DoubleNumberToken: divide: dimensions don't match. size(a) yields 3.000 3.000, size(b) yields 3.000 1.000. Entering a and b shows that they're assigned correctly. With identical input, Matlab (correctly) returns 3.667;0.333;-1.333. This is literally the first thing I've tried with Addi. I imagine that there's something it does correctly and well but this is not at all encouraging.

A Google User

One small problem The app is excellent, but I have one issue: I can't get the cross product to work, this is what happens: >> A = [1,2,3]; >> B = [2,3,4]; >> cross(A,B) ??? cross(A,B) ERROR: ERROR: SubAssign: conversion to cell from something not possible Could someone please tell me what I do wrong?

A Google User

Seemed great at first. At first I thought it was pretty neat, but it returns errors constantly. Can't even do rref.

A Google User

Awesome! Octave for smartphones and tablets! Really useful for mathematical things on the go. Some functions don't work. I reeeeaaally need the scatter3 function. Unfortunately it fails :(.

User reviews

Gorgeous little app. It's nice to actually be able to do useful calculations mobile. Addi feels like running Octave from terminal, with the bonus of function mnemonics. It's easily as nice as Qalculate! Or SpeedCrunch on desktop, which is what I'm used to, and it's nice to have that functionality on a calculator-sized device when working with a scratchpad. I'm a new Android user, but this is the first app to make my Nexus 7 seem like a "real computer." Serious kudos. = )

Impressive! Very useful powerful project. Keep up the good work!

Awesome While buying an android tablet, my friends discouraged me showing no efficient soft like matlab available. Now I can smile on them. This app is great but need to improve more. I more library files required along with better GUI. Hope the developer will give us a real alternative to matlab.

Awesome! However... This is an awesome app that functions exactly as you'd expect. The only flaw is that, when using the custom keyboard, there is no obvious way to get out of parentheses. Add arrow keys to the keyboard to allow you to move within a line entry and this is a six-star app! In the mean time, use your default device keyboard to move around.

My Favorite Productivity App, hands down As a physics major I have to do a lot of work with MatLab which isn't available for the android platform, much less my mobile phone. I stumbled across this app completely by accident and it's been fantastic. It's great for quick computations if you don't want to use the standard built-in calculator, it's got substantially more functions, can run .m files you've written on another phone or on an actual computer, and with the plotting and mapping packages available it's indispensable in a pinch if you're tr

Good app...just need to be able to go back and change equation once you hit enter

Awesome octave/matlab emulator Great for simple matlab tasks, just need to get that control systems part in, after all matlab was originally created for control systems analysis!

Java lang error when opening/running mfile. Doesnt support "load" function for mat file

Awesome! Needs mobile interface I really like this app on my tablet. However, there is no good way to recall your last command like with the up arrow on the desktop version. Suggest adding gesture support for that.

support! only matlab clone on android, not fully functional but strongly support

Need IO File Explorer to open .m file huh? It's not very good like this! though a good app it is.

# What's New

Minor: Help info prints now from experimental interpreter.

Major: Got Octave built for Android. To use Octave interpreter instead of existing one, go to preferences/settings and enable it. It is not the default as there are some obvious issues to work through (plotting, help, etc), but this is a huge step forward and I perceive no major technical hurdles in solving them at this point.

# Additional information

Updated

May 10, 2012

Size

20M

Installs

10,000 - 50,000

Current Version

1.98

Requires Android

1.1 and up

Content Rating

Everyone

Permissions

Report

Flag as inappropriate Offered By

Corbin Champion

Developer

# Similar

## AddiPlot

Advanced plotting tool. Supports 2D and 3D plotting and so much more.

Support now on kickstarter: http://www.kickstarter.com/projects/6438588/sombreros-for-the-android-world

Most of gnuplot ported.

Can be used standalone or be used by other apps.

Used by Addi only right now. Addi is a tool like Matlab or Octave. If you are a dev and want to use this as your plotting engine, contact me.

Some terminal types currently not supported (PNG, BMP, JPEG), but will be later.

Mouse/touch interaction for zooming currently not supported, but will be later.

## MATLAB Mobile

Note: To use MATLAB Mobile, you will need a MATLAB license that is current on MathWorks Software Maintenance Service.

Connect to MATLAB remotely from your Android smartphone or tablet.

MATLAB Mobile™ is a lightweight desktop on your Android device that connects to a MATLAB session running on MathWorks Cloud or on your computer. From the convenience of your Android device, you can run scripts, create figures, and view results.

Features

* Command-line access to MATLAB

* Access to MATLAB workspace

* Ability to view MATLAB figures on your Android device

* Record of commands typed on the device in your command history

* MathWorks Cloud connectivity and storage

* Windows, Mac, and Linux connectivity

* Acquire data from device sensors

Limitations

MATLAB Mobile does not support:

* MATLAB apps such as Curve Fitting or Signal Analysis

* Creating graphical interfaces using GUIDE

* MATLAB Editor

* Simulink graphical environment, but the 'sim' command is supported at the MATLAB Mobile command line

* Interaction with 3D figures

About MATLAB

MATLAB is the leading technical computing software for algorithm development, data visualization, data analysis, and numeric computation. MATLAB is used in a wide range of applications, including signal and image processing, communications, control design, test and measurement, financial modeling and analysis, and computational biology.

Requirements

1. One of the following MATLAB licenses:

* Professional or academic license for R2012a or later with an up-to-date MathWorks Software Maintenance Service contract.

* MATLAB Student or MATLAB and Simulink Student Suite R2014a or later.

* MATLAB and Simulink Student Version R2012a or later.

* MATLAB Home.

2. MATLAB Connector installed on the same computer as MATLAB. Starting with R2013a, the MATLAB Connector will be installed with MATLAB. For R2012a and R2012b, download MATLAB Connector at http://www.mathworks.com/mobile/.

3. Android 4.0 or later

MATLAB Mobile and the MATLAB Connector are intended for use behind a firewall on a private network. Virtual Private Network (VPN) use is recommended when used over the public Internet or via 3G or 4G.

## MathsApp Scientific Calculator

4073Labs

1

MathsApp Scientific Calculator is aiming to be the best scientific calculator app for Android.

Looking for a graphing calculator, matrix support, or simply want to support the cause of creating the greatest scientific calculator app on Android? Get MathsApp Graphing Calculator: https://play.google.com/store/apps/details?id=com.mathsapp.graphing

MathsApp Scientific Calculator includes:

-Landscape mode

-Easily adjust previous calculations or insert previous results

-Binary, octal and hexadecimal number support

-Scientific, engineering and regular number formatting

-Physical constants

-User-friendly interface

-No advertisements

-Advanced calculations

-Arithmetic

-Exponentiation

-Trigonometric functions

-Advanced statistical distribution functions

-List support

-Complex number support

-Percent support

## Scientific Calculator 3D Free

"Scientific Calculator 3D Free" is a powerful math tool for Android consists of 5 calculators. "Matrix Calculator", a tool to calculate the decompositions and various operations on matrix, "Equation Solver" an instrument capable of solving equations of degree n, "Graphing Calculator" a real scientific graphing calculator can draw graphs in 2D and 3D, "Currency Converter" a currency converter always updated with the new exchange rates and "Unit Converter" a small units converter. In addition we find a comfortable Periodic Table of Elements.

Features in detail:

-Matrix Calculator:

--Derived Quantities

Determinant

Rank

Inverse

PseudoInverse

--Decompositions

Cholesky decomposition

LU decomposition whit pivoting

QR decomposition

SVD - Singular Values decomposition

Eigenvalues - Eigenvectors

--Linear Systems

Linear Systems M N

-Graphing Calculator:

--Sample expressions

variable evaluation: pi

function evaluation: sin(0)

variable definition: a=3.5

function definition: f(x)=x^2-1

parentheses: (1-x)^2

--Logarithms and power

sqrt(x): square root; x^0.5

cbrt(x): cube root; x^(1/3)

exp(x): exponential; e^x

log(x), ln(x): natural logarithm

log2(x), lb(x): binary logarithm

log10(x), lg(x): decimal logarithm

log(base,x): arbitrary base logarithm

--Trigonometric - radians

sin(x), cos(x), tan(x)

asin(x), acos(x), atan(x)

--Trigonometric - degrees

sind(x), cosd(x), tand(x)

asind(x), acosd(x), atand(x)

--Hyperbolic

sinh(x), cosh(x), tanh(x)

asinh(x), acosh(x), atanh(x)

--Other

gcd(x,y): greatest common divisor

comb(n,k): combinations

perm(n,k): permutations

min(x,y), max(x,y)

floor(x), ceil(x)

abs(x): absolute value

sign(x): signum

rnd(): random value from [0,1). rnd(max): random value from [0, max).

gamma(x): (x-1)!

mod(x,y): modulo

--Complex numbers

i or j is the complex base. Example:

i*i

(1+i)^2

e^(i*pi)

--Operators

+ - × ÷ basic arithmetic

^ power

% percent

! factorial

# modulo

√ square root

' first derivative

--Binary, octal, hexadecimal

Value converter in binary, octal or hexadecimal input prefixing respectively 0b, 0o, 0x, in decimal.

binary: 0b1010

octal: 0o17

hexa: 0x100

--Derivative

It is possible to compute the first derivative of a function with one argument using the prime notation: log'(5).

The prime mark (quote) must appear immediately after the name of the function, and must be followed by open-parentheses.

The derivative may be plotted e.g. sqrt'(x).

To compute the derivative of an expression you must define the expression as a named function.

Eg f (x) = x ^ 2 + x, after insertion, type f '(x) to display the graph of the derivative.

--Multi plot

To plot multiple functions on the same 2d graph, simply enter them on the same line separated by ";".

--Special Function

Limit Calculator

Indefinite Integrals

Derivative

Definite Integrals

Taylor Series

Tangent Line

ArcLength & SurfaceArea

Formula Tables

--Graph (MultiPlot up to 6 functions)

Graph of parametric functions

Graph in polar coordinates

MultiPlot 3D

--Widget Calculator

Say about us

http://appszoom.com/android_applications/tools/bismag-calculator-3d_czsgc.html

http://www.androidworld.it/2013/05/25/italia-chiama-android-bismag-calculator-3d-speeder-nasoni-ditalia-159363/#

Facebook:

http://www.facebook.com/pages/BisMag-dev/423719257659310

"BisMag Scientific Graphing Calculator 3D"is a demo version of "BisMag Calculator 3D" if the product is to your liking and you find it useful try the PRO version.

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## Mathmatiz

yakgg

1

Mathmatiz is much more than a scientific graphing calculator. It's a convenient tool for mathematical computations, capable of complex number and matrix (matrices, linear algebra) computation, curve plotting and .m file support. This program can also be used as a file manager and text editor.

Operation of Mathmatiz is similar to Matlab, takes mathematical expression as input. Friendly user-interface, easily retrievable input history makes your problem-solving experience much more enjoyable than any other applications. Mathmatiz is the best android calculator.

Your feedback is important to the development of this application. Bug report and function requests, please e-mail mathmatiz@gmail.com.

## Symbolic

Symbolic is just another GUI for the immense powerful Reduce computer algebra system which is open source software created by many programmers during several decades. You may find lots of examples and tutorials about Reduce in the internet.

This app is based on code provided by Ahmad M. Akra and Prof. Arthur C. Norman (Codemist Ltd. JLisp, precompiled Reduce engine and most of the Latex formatting feature) who published the app AndroidReduce and made available the corresponding source code via sourceforge.net (great, many thanks!).

You may choose between single line and multiline input. In single line mode you may omit closing parentheses and/or the semicolon, but in multiline mode you have to take care of matching parentheses by yourself and explicitly type in a semicolon for telling Reduce that the expression is complete. Multiline mode is convenient for breaking down more complex expressions into several lines and always applies to reading script files. Processing starts when tapping the Go button (if visible) or the Done or Next button of the soft keyboard.

In Settings you find some options to modify the look of the output (preferred width, font size, text or latex).

You may process Reduce scripts stored in files (*.red or *.txt) with ease. Just enter a filename in the input field and tap menu-entry Read to execute it. Or save your precious work by tapping Save. When saving, the tex formatted output fields go to png-files with increasing numbers added to the original file name. But this only works for output fields not too big. Plain text outputs go to a text-file along with the corresponding input expressions. This may be useful for later processing the results in Latex or similar text processing tools.

If you do not know the exact filename containing your desired script just leave the input field empty (e.g. tap Clr button) and tap menu-entry Read to reveal a file selector box showing the files in the actually chosen directory.

Choosing a file only copies the filename to the input text field. Don\'t forget to tap Read again (or the Go button, if visible) to actually start processing the script file because you still have the option to add "in " before the filename to let Reduce process the whole file at once (what is mostly faster).

Tapping Clr or Go or Done during reading a script file will terminate processing the file. But the definitions realized so far stay valid in Reduce till you Reset Reduce.

The directory to read from or to save to may be defined via Settings. This global directory is also valid for in and out statements of Reduce itself. But nested input files do need complete pathnames along with "in" or "out" or "shut".

You may also modify some cosmetic features like background and text colors and the availability of the Clear and Go button which may support an efficient workflow. The settings get saved once you finish Settings with OK and are available next time you start the program.\n\n

So, happy calculating!

Please report bugs, questions and comments to Dieter Egger (dr.egger@alice.de).

## Maths++

You have big numbers in front of you? Lots of decimal and signed numbers? If you cant feel like you are in the mood to calculate all by yourself; YOU ARE IN THE RIGHT PLACE! Decimal Numbers, Signed Numbers do not matter, you can calculate everything!

Here below lies what this app are capable of;

-You can search most used formulas without needing an internet connection!.

-You have everything you need about scientific calculation with these program's calculator!!!

- You can convert units to other units such as mile, km or pound kg etc!!!!

-2x2/3x3 and 4x4 Matrix Multiplication, Transpose, Determinant, Inverse,Trace and EigenValues, Reduced Row Echolon Form(2x3,3x4,4x5) and LU Decomposition

-Length and Normal of Vector and if 'Product' enabled, Dot Product, Cross Product, Angle and Distance between two vector..

-Cartesian & Spherical Coordinates Conversion

-Standart & Polar Points Conversion and Length/Area calculation given points.

-Sample Size Determination

-Rotation of 2d/3d Points

-Finding plane equation given three points & distance from point to plane!!!

-You can solve Linear Systems and find equations by given points such as linear, quadratic and circle!!!!

-Age Calculation in seconds, minutes, hours etc..

-You can calculate roots and various attributes of Quadratic and Cubic Equations!!!

-Just give input of numbers with space and you get standart deviation, added, multiplied, lowest and highest, median and summation/multiplication series!

-You can calculate areas under Curves!!!

-4 Input Karnaugh Maps Prime Implicants!!

-Base Converter from base 2 to base 36

-Given three points, you can find circle center point and equation!

-You can calculate Perimeter,Area,Volume of various shapes and you can get Roots and Vertex Points of Parabolic Equations(Cubic and Quadratic) even it is complex and you can solve linear systems given equations or given points you can find the graph and the function.

-Any part of the program, you can use decimal and signed numbers..not just POSITIVE NUMBERS!

Here below lies what this app are capable of;

-You can search most used formulas without needing an internet connection!.

-You have everything you need about scientific calculation with these program's calculator!!!

- You can convert units to other units such as mile, km or pound kg etc!!!!

-2x2/3x3 and 4x4 Matrix Multiplication, Transpose, Determinant, Inverse,Trace and EigenValues, Reduced Row Echolon Form(2x3,3x4,4x5) and LU Decomposition

-Length and Normal of Vector and if 'Product' enabled, Dot Product, Cross Product, Angle and Distance between two vector..

-Cartesian & Spherical Coordinates Conversion

-Standart & Polar Points Conversion and Length/Area calculation given points.

-Sample Size Determination

-Rotation of 2d/3d Points

-Finding plane equation given three points & distance from point to plane!!!

-You can solve Linear Systems and find equations by given points such as linear, quadratic and circle!!!!

-Age Calculation in seconds, minutes, hours etc..

-You can calculate roots and various attributes of Quadratic and Cubic Equations!!!

-Just give input of numbers with space and you get standart deviation, added, multiplied, lowest and highest, median and summation/multiplication series!

-You can calculate areas under Curves!!!

-4 Input Karnaugh Maps Prime Implicants!!

-Base Converter from base 2 to base 36

-Given three points, you can find circle center point and equation!

-You can calculate Perimeter,Area,Volume of various shapes and you can get Roots and Vertex Points of Parabolic Equations(Cubic and Quadratic) even it is complex and you can solve linear systems given equations or given points you can find the graph and the function.

-Any part of the program, you can use decimal and signed numbers..not just POSITIVE NUMBERS!

There will be more improvements depending on demand..

## Prime Calc

Aeiou

1

PrimeCalc - free scientific symbolic calculator

- 70 functions, 20 mathematical constants and up to six variables

- New functions and constants can be defined by the user

- Supports complex numbers

- Matrices, vectors, sets and calculations on them

- Solves the mathematical equations

- Calculate the integrals and derivatives

- Step-by-step calculations

- And many more

Supported functions, operators, and mathematical constants:

Arithmetic:

Operators +, -, ×, ÷, %

x^n - nth power of x

√(x) - Square root of x

√(n, x) - nth root of x

ln(x) - Natural logarithm of x

log(x) - Logarithm of x to base 10

log(n, x) - Logarithm of x to base n

∑(f(x), imin, imax) - Summation of f(x) from imin to imax

∏(f(x), imin, imax) - Product of f(x) from imin to imax

Mathematical analysis:

∫(f(x)) - Indefinite integral of f(x)

∫(f(x), xmin, xmax) - Definite integral of f(x) from xmin to xmax

∂(f(x)) - Derivative of f(x)

lim(f(x), c) - Limit of f(x) when x approaches c

Equation solving:

Representation of polynomial - x^2+3x-2=0

= - Polynomial equation operator

Numerical Functions:

m mod n - Remainder of m ÷ n

gcd(m, n) - Greatest common divisor of m and n

lcm(m, n) - Least common multiple of m and n

abs(n) - Absolute value of n

round(n) - Integer closest to n

frac(n) - Fractional part of n

floor(n) - Floor value of n

ceil(n) - Ceiling value of n

Complex numbers:

Representation - 5+2i

re(c) - Real part of complex number c

im(c) - Imaginary part of complex number c

Statistics:

median([a]) - Median of [a]

gmean([a]) - Geometric mean of [a]

amean([a]) - Arithmetic mean of [a]

randi(n) - Random integer from 0 to n

randr - Random real from 0 to 1

Number theory:

harmonicN(n) - nth harmonic number

Combinatorics:

n! - Factorial of n

binomial(n, k) - Binomial coefficient

multinomial(n1, n2, ...) - Multinomial coefficient

catalanN(n) - nth Catalan number

fibonacci(n) - nth Fibonacci number

Trigonometric functions:

sin(x), cos(x), tan(x)

sec(x), csc(x), cot(x)

asin(x), acos(x), atan(x), acot(x)

Hyperbolic functions:

sinh(x), cosh(x), tanh(x)

arsinh(x), arcosh(x), artanh(x)

Matrixes:

Representation - [[1,2],[3,4]]

[m1]⋅[m2] - Product of [m1] and [m2]

tran([m]) - Transpose [m]

ctran([m]) - Conjugate and transpose [m]

inverse([m]) - Invert [m]

det([m]) - Determinant of [m]

tr([m]) - Trace of [m]

mpow([m], n) - nth matrix power of [m]

Number sets:

Representation - [1,2]

union([a1], [a2]) - Union of two sets

intersec([a1], [a2]) - Intersection of two sets

max([a]) - Largest element of [a]

min([a]) - Smallest element of [a]

Constants:

π - Number Pi

e - Euler's number

i - Imaginary unit

∞ - Infinity

γ - Euler–Mascheroni constant

G - Catalan's constant

A - Glaisher–Kinkelin constant

φ - Golden ratio

κ - Khinchin's constant

C₂ - Twin prime constant

ζ₃ - Apéry's constant

B₄ - Brun's constant for prime quadruplets

B₂ - Brun's constant for twin primes

EB - Erdős–Borwein constant

δ - Feigenbaum first constant

α - Feigenbaum second constants

BL - Legendre's constant

M₁ - Meissel–Mertens constant

## Vibration Monitoring

Android devices have a vibration sensor - accelerometer. It is a sensitive sensor that reports the device vibrations.

This tool is powerful vibration meter tool.

It has the following features:

- shows vibrations in real time

- saves vibration data into SD card

- provides configurable sound alarm that may be used to:

- detect the earthquakes when you sleep

- detect if somebody opens the door when you sleep

It is recommended to use the battery charger when it works for a long time.

If you want to recommend the alarm feature that may recognize earthquake

http://www.facebook.com/pages/Earthquake-Alarm/311308608954778

We will also use this facebook page to keep you informed about the work progress and current activities and plans for the future.

This application comes with ABSOLUTELY NO WARRANTY.

Notice:

There is a problem that occurs on some devices. Some devices may not provide the data when from the vibration sensor when the screen is off. This is an Android error.

We are trying to find a good workaround.

Send us the information if the application does not work, please

Very deep technical information http://code.google.com/p/android/issues/detail?id=3708

## SI-Units

Tecnics

1

SI-Units is the perfect tool if you need to quickly convert between units. SI-Units has the ability to convert between many different types of units listed bellow:

- Angle

- Area

- Density

- Energy

- Heat

- Length

- Pressure

- Time

- Velocity

- WaveLength

- Capacitance

- Energy

- Force

- Fuel Consumption Rate(mass)

- Fuel Consumption Rate(volume)

- Mass

- Period

- Power

- Weight Density

- Volume

- and the list goes on with many more

SI-Units is a tool that anyone can use, kids , students, engineers, and the list goes on. Easy and simple use, launch the app and select your conversions.

Features:

* SI-Units is an international units converter.

* SI-Units is allows you to make Conversions By Subject as well as Conversions By Units.

Usage:

- Launch the app, and select your conversion on left side list, the app will show all the available units for selected conversion

- Enter your input in any textfield and press ' Calculate ' button, thats it your conversions are calculated and displayed result

- To see the available units for particular category of units, select your units category on app home screen image available at right side.

- Angle

- Area

- Density

- Energy

- Heat

- Length

- Pressure

- Time

- Velocity

- WaveLength

- Capacitance

- Energy

- Force

- Fuel Consumption Rate(mass)

- Fuel Consumption Rate(volume)

- Mass

- Period

- Power

- Weight Density

- Volume

- and the list goes on with many more

SI-Units is a tool that anyone can use, kids , students, engineers, and the list goes on. Easy and simple use, launch the app and select your conversions.

Features:

* SI-Units is an international units converter.

* SI-Units is allows you to make Conversions By Subject as well as Conversions By Units.

Usage:

- Launch the app, and select your conversion on left side list, the app will show all the available units for selected conversion

- Enter your input in any textfield and press ' Calculate ' button, thats it your conversions are calculated and displayed result

- To see the available units for particular category of units, select your units category on app home screen image available at right side.

Note : To run this app Android version should be gratter than 3.0

## MatCalc - Matrix Calculator

kc

1

MatCalc is an open source and free matrix calculator. It is powerful and easy-to-use, ideal for high school and undergraduate maths or engineering students. It features 18 matrix operations from finding inverses, calculating norms to solving linear system of equations.

Although this app is in BETA, everything should work as intended. Please let me know if you find any bugs.

Source code is available on GitHub. https://github.com/cong89/matcalc

## Calculator ++

Are you looking for an efficient and easy-to-use calculator?

Do you want to solve both simple and complex problems?

Try Calculator++, a multipurpose calculator app with slick and intuitive user interface!

Do you want to solve both simple and complex problems?

Try Calculator++, a multipurpose calculator app with slick and intuitive user interface!

★ Save your time!

• Access additional features from the main screen of the app using gestures. For example, to use «%» slide button «/» up

• You don't need to press «=» anymore - result is calculated automatically

• Copy/paste with a single button press

• App supports both portrait and landscape screen orientations

★ Personalize!

• C++ has two layouts: standard and engineer. Choose one which suits you best either from the initial wizard or from the application settings

• Set theme you like

• Add home screen widget

★ Do calculations without switching between the apps!

Calculator++ can work in a separate window floating over other applications on your phone

★ Calculate percentages, square roots, powers, trigonometric functions!

Calculator has a big variety of built-in functions and supports adding new user-defined functions

★ Plot 2D and 3D graphs!

Several functions can be plotted simultaneously

★ Use powerful mathematical capabilities of the app:

• Do calculations with variables and constants

• Use built-in functions or add your own

• Integrate and differentiate

• Do calculations with fractions and simplify expressions

• Do calculations with complex numbers

The app supports devices with Android version 2.2 and higher and is open source. The app contains adverts which are shown on the secondary screens. To remove them please purchase a special option from the application settings.

Calculator++ on Facebook: http://facebook.com/calculatorpp

Calculator++ on Vkontakte: http://vk.com/calculatorpp

# More from developer

## GNURoot

GNURoot provides a method for you to install and use GNU/Linux distributions and their associated applications/packages alongside Android.

This does NOT require root.

A regular uninstall fully cleans up after this application.

This is expandable and you will be able to install your own applciations/packages.

Inside GNURoot, you can create a root file system), launch into it, or delete it.

Read the description of the GNURoot Wheezy, Gentoo, Fedora or Aboriginal apps in the Play Store to get some hints on how to get started using them.

https://play.google.com/store/apps/details?id=champion.gnuroot.wheezy

https://play.google.com/store/apps/details?id=champion.gnuroot.gentoo

https://play.google.com/store/apps/details?id=champion.gnuroot.fedora

https://play.google.com/store/apps/details?id=champion.gnuroot.aboriginal

The moto is: "This ain't done, until everything* will run"

*everything == all linux, user space applications, without having to root your device. Some things (a small number of things), that actually require root will not work (like inserting a kernel module).

Key goals:

Choice or GNU/Linux rootfs to start with:

Currently two choices, many more to come.

All applications that don't absolutely require root should function as normal:

apt-get now working.

Following step is to get a graphical interface for the desktop, terminal and applications. Currently, only launches an Android Terminal Emulator. Proof of concept done. Refinement left.

Make this work nicely alongside Android:

Already works like a "normal" application.

Next step is to provide useful intents for users and applications (with permissions) to use.

Provide proper support and bug fixes:

Release a pay-what-you-want model, so more time can be put into this. Now in place. Decide whether it should be mandatory.

Improve performance:

Minimize the performance effect of the tricks used to make this all work. Quite good now.

Reduce Footprint:

Move as much as possible to the sdcard.

Only install what is necessary and let the user grow it from there.

Support multiple architectures:

Only arm supported. No reason why MIPS and x86 cannot be supported too.

The roots mostly contain GPL code, but for this launcher I am the copyright holder and it is not under the GPL, but instead the Apache v2. It contains a modified version of the Android Terminal Emulator, which is also under the Apache v2.

Please: file bugs, feature requests of view code here:

https://github.com/corbinlc/gnuroot

## GNURoot Wheezy

Allows you to create and launch a Debian Wheezy rootfs without rooting your device when used along with GNURoot (champion.gnuroot).

Primarily, I install packages with apt-get (http://linux.die.net/man/8/apt-get) and I suggest you do the same). To use apt-get you will need to click the "Launch as Fake Root" checkbox. A good place to start is to do:

apt-get update

apt-get upgrade

Then start working. If you find out that something you need is not installed, just apt-get it. To install less, do this:

apt-get install less

That is pretty obvious, but sometimes it is not. You can use a search engine (like google to help you out). For example, I found out to install R, I should do this:

apt-get install r-base

You can also search for packages using

apt-cache search some_keyword

A very popular package to add right away is this one:

apt-get install build-essential

This gets you setup to run the make and compile steps of many SW projects.

## Octave

This is launches Octave for Android. Octave is like Matlab (trademark of Mathworks), but free (as in freedom) software. Not some similar program, but really Octave running natively.

The app is now free (as in $) to use, but a donation is appreciated to keep things going.

You are required to get the Octave Main Package (com.octave.main) to use this.

You are required to get the Octave Gnuplot Package (com.octave.gnuplot) to support plotting.

There are many additional packages (com.octave.*) for use.

This is a different sort of app. Unpacking the executable and other files necessary for Octave to run will take awhile when you install or upgrade this, but will be worth it. Whether this is installed to the sdcard or to internal storage, the executables and libraries will take up around 100MB of internal storage either way.

You can add .m files and a .octaverc startup file in an external storage directory setup for you. Often at /sdcard/GNUOctave/home.

Your latest plots (.png files) can be found in an external storage directory setup for you. Often at /sdcard/GNUOctave/intents.

You will be running in a fake chroot of sorts which includes Octave and many of the programs you expect to find in a standard GNU/Linux (read Debian) install. The fake chroot is split between your external/shared partition (often /sdcard) and your internal (/data/data/com.octave) to save space.

Plot commands and edit commands fire off intents to use whatever image viewer or text editor you have.

See Octave Documentation:

http://www.gnu.org/software/octave/doc/interpreter/

See the FAQ:

https://github.com/corbinlc/octave4android/wiki/FAQ

File bugs and feature requests here:

https://github.com/corbinlc/octave4android/issues

See code here for packages here:

https://github.com/corbinlc/octave4android

This launcher is licensed under the Apache License 2.0.

No GPL licensed code is found within this app, but is found in the packages needed to run.

## GNURoot WheezyX (xterms)

Like GNURoot Wheezy but supports xterms, and launches a vncserver at launch.

You can connect to this simple graphical desktop via your favorite vncviewer on your android device or another device on your network (like a PC). The default password is "password".

There seems to be an issue with most android vnc viewers. If you zoom too far out, your device may no longer respond to touches. I need to figure this out, but for now, don't zoom out bigger than the desktop. Stay zoomed in. Don't beat me up about this, but do be warned and please do file bugs and feature requests.

Allows you to create and launch a Debian Wheezy rootfs without rooting your device when used along with GNURoot (champion.gnuroot).

Primarily, I install packages with apt-get (http://linux.die.net/man/8/apt-get) and I suggest you do the same). To use apt-get you will need to click the "Launch as Fake Root" checkbox. A good place to start is to do:

apt-get update

apt-get upgrade

Then start working. If you find out that something you need is not installed, just apt-get it. To install less, do this:

apt-get install less

That is pretty obvious, but sometimes it is not. You can use a search engine (like google to help you out). For example, I found out to install R, I should do this:

apt-get install r-base

You can also search for packages using

apt-cache search some_keyword

A very popular package to add right away is this one:

apt-get install build-essential

This gets you setup to run the make and compile steps of many SW projects.

## GNURoot Gentoo

Allows you to create and launch a Gentoo rootfs without rooting your device when used along with GNURoot (champion.gnuroot).

Gentoo can be complicated to work with. Read this:

https://www.gentoo.org/doc/en/handbook/handbook-arm.xml

Specifically look at "Working with Gentoo" and "Working with Portage" sections.

"Gentoo" is a trademark of Gentoo Foundation, Inc.

This is not part of the Gentoo project and is not directed or managed by Gentoo Foundation, Inc.

## Corbin Champion US$1 Payment

My Android applications will now be supported by a "pay what you want" system. You can choose your price US$1 - US$50 in US$1 increments.

The first app that will be migrated to this system will be Octave, followed by others.

While this may be disappointing for some, I have realized that giving this work away free (as in $) doesn't serve your or my interests well. It is clear from users that they love what I have done, but want more features and better support. It bothers me significantly that I am not able to provide it because of time and money constraints. This will not be about making a lot of money, this will simply be about creating a better project by paying for developer time going forward.

By the way, if you have paid previously via the Play Store for any of my apps, no additional charge is required. Also, paying one amount will cover your usage of all of my apps, which will all adopt the same payment system.

How money is spent (after Google gets their cut):

10% (or more): Donated to Free or Open projects that my works is dependent on.

10% (or more): To the Lord's work (humanitarian work).

Remaining: Developer time

There is pretty much 0 overhead for the work I do.

## Tiny Utils

Android Terminal Emulator, BusyBox, Frotz, Perl and SSH via Dropbear (dropbear just added, so need to do more testing with it) without rooting your device.

Tiny Utils combines tiny versions of many common and useful GNU/UNIX utilities and terminal into a single small Android application. It provides replacements for most of the utilities you usually find in GNU fileutils, shellutils, and more.

Tiny Utils installs BusyBox, microperl (a small perl interpreter), patchelf, frotz (so you can play Z code interactive fiction games) and dropbear an SSH client and server. Tiny Utils also includes the Android Terminal Emulator within it, so you have a nice, proven work environment where you can use all this capability.

Tiny Utils is not all business though as it now has frotz which allows you to play z-code games. See the screen shots of examples of downloading and playing a couple of popular games (Zork and Spider and Web). Given how nice the Android Terminal Emulator is, I think this might be the best environment for playing z code games.

All combined, this give you many of the commands you are used to having while working at a GNU/Linux Terminal.

Find the full list of BusyBox commands here: http://www.busybox.net/downloads/BusyBox.html

Also, Tiny Utils does not require you to have a rooted device to install it. Being such, it does not modify your Android system at all and can be uninstalled in a normal fashion. While some commands, like chroot, or su, require you to have root permissions, the most commonly used commands do not.

Known limitations:

Some commands, require rooting your device to work properly.

Some commands will not work as expected because Android is not GNU/Linux (tell me what you need/want if it is not working, so I can prioritize).

All that said, your device will get a LOT more useful and powerful with this installed.

Source code is posted and I will be posting many examples (over time) of awesome ways you can use this here: https://github.com/corbinlc/tinyutils

Please provide feedback. Rate it and tell others if you think it is good. If you run into any problems please file an issue here https://github.com/corbinlc/tinyutils/issues so I can get any details I need and so you can track progress on the issue.

Also, if you have any suggestions/contributions that you think will improve this further, don't be shy. While I am charging for this, I am doing so minimally to make sure this continues to be supported and improved going forward and I am pretty sure this will be worth more to you than what is being charged.

## GNURoot Fedora Remix

Allows you to create and launch a Fedora rootfs without rooting your device when used along with GNURoot (champion.gnuroot).

Primarily, I install packages with yum (http://linux.die.net/man/8/yum) and I suggest you do the same). To use yum you will need to click the "Launch as Fake Root" checkbox. A good place to start is to do:

yum update (this may take quite a while).

Then start working. If you find out that something you need is not installed, just yum install it. To install less, do this:

yum install less

That is pretty obvious, but sometimes it is not. You can use a search engine (like google) to help you out.

You can also search for packages using

yum search some_keyword

"Fedora" is a trademark of Red Hat, Inc.

This is not part of the Fedora project and is not directed or managed by Fedora project.