App Inventor Extensions

Math Extension

See the App Inventor Extensions document about how to use an App Inventor Extension.

For questions about this extension or bug reports please start a new thread in the App Inventor community. Thank you.

For feature requests please contact me by email. To be a sponsor of a new method already is possible starting from only 10 USD! With your contribution you will help the complete App Inventor community. Thank you.

Jul 19h, 2017: Version 1: initial release
Note: using the extension version 1 together with another Pura Vida Apps extension built between July 1st and July 20th might result in error message Unable to find TaifunTools component while opening a project. Use extension version 1a instead.

Jul 22h, 2017: Version 1a: new build using extension-specific directory in aix file

Description

Extension to parse mathematical expressions.
Required permission: none
This extension uses the mXparser library Version 4.1. Thank you Mariusz Gromada for the mXparser library.
The functionality of this library is overwhelming. See the details of the mXparser built-in math collection here...

Main functionalities

• basic operators, i.e.: +,- , *, ^, !
• Boolean logic operators i.e.: or, and, xor
• binary relations i.e.: =, <, >
• math functions (large library of unary, binary, 3-args, and n-args functions) i.e.: sin, cos, Stirling numbers, log, inverse functions
• constants (large library), i.e.: pi, e, golden ratio
• n-arguments functions, i.e.: greatest common divisor
• iterated summation and product operators
• differentiation and integration

Few examples of string equivalent to the math formula notation

screenshot taken from mathparser.org.

Properties

Display the license of the mXparser library.

Methods

Parse a mathematical expression and return the result.

A very simple example

See also the video by azaotl Making a calculator in less than an hour using Taifun's Math Extension. Thank you azaotl!

Example Use

Terms and Conditions

• Have fun and use this extension in your App Inventor projects! Pura Vida!
• THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
• This is is the only authorized place to download this extension. It is not allowed to host this extension somewhere else and offer it for others to download, be it on another website or market place or similar. The reason is, everybody should be able to have the opportunity to donate something in case you like my work. You are allowed to provide a link to this site, so others can download the extension here. You will find the most up to date version always here including documentation and usage examples. Thank you for your kind understanding.

Questions and Answers

Q1: How do you access internal functions like e.getComputingTime()?
A: That's unfortunately not possible. You "only" can use the functionality of the built-in math collection.

Download

Download TaifunMath extension (aix file)
Download Math Test project (aia file)

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This work by Pura Vida Apps is licensed under a Creative Commons Attribution-ShareAlike 3.0 Unported License
with attribution (name=Pura Vida Apps and link to the source site) required.