List

[Lukas]

Hello,
I want to make a list and print the average of the list to a label:
If the app receives a new value from the arduino per bluetooth, it should replace the previous one in the list and so on

but i do not know how...

Lukas

[Taifun]

to get the average, use a for each item in list loop, add all the items and in the end divide by the number of items

• How to work with Lists by Saj
• How to work with Lists and Lists of lists (pdf) by appinventor.org

in case you are familiar with JavaScript you also could use some JavaScript... see my sort example here

How to sort a list using the webviewer(!)

which could be adjusted accordingly to provide the average instead

A very good way to learn App Inventor is to read the free Inventor's Manual here in the AI2 free online eBook   http://www.appinventor.org/book2 ... the links are at the bottom of the Web page.  The book 'teaches' users how to program with AI2 blocks.

There is a free programming course here http://www.appinventor.org/content/CourseInABox/Intro  and the aia files for the projects in the book are here:  http://www.appinventor.org/bookFiles  

How to do a lot of basic things with App Inventor are described here:  http://www.appinventor.org/content/howDoYou/eventHandling  .

Also do the tutorials http://appinventor.mit.edu/explore/ai2/tutorials.html to learn the basics of App Inventor, then try something and follow the

 Top 5 Tips: How to learn  App Inventor

You will not find a tutorial, which does exactly what you are looking for. But doing the tutorials (not only reading a little bit) help you to understand, how things are working. This is important and this is the first step to do.

Taifun

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Trying to push the limits of App Inventor! Snippets and Tutorials from Pura Vida Apps by  Taifun.