DigCod Python Scripts for TI-Nspire

This repository contains a collection of Python scripts designed for use with the TI-Nspire calculator.

Note: You may have to use a TI-nspire CX II, the older version TI-nspire CX may not support python scripts. It requires OS 5.20 or greater, the older TI-nspire CX can only be updated up to version ~ 4.5. You might take a look at Ndless

The reason I don't upload these scripts to the Studentenportal is that they are likely to be removed. The Studentenportal is monitored by lecturers who delete not allowed stuff. These scripts aren't currently illegal, but they could become because they make the exam much easier.

Usage

To use these scripts on your TI-Nspire calculator:

1. Connect your Handheld to the computer.
2. Open the TI-Nspire Student Software.
3. Create a new Python script within the software.
4. Copy and paste the content of each .py script into the new Python script you created.
5. Use the "File -> Save to Handheld" function to transfer the script to your calculator.

Cracked version of Students-software can be found here.

Alternatively:

1. Open Chrome (it's required to use Chrome for this method).*1
2. Navigate to TI-Nspire Navigator.
3. Choose the option to transfer files. *2

*1 This method doesn't work for linux. The only option for linux is AFAIK through a VM.

*2 Apparently you have to rename the .py to .tns to create a supported file type, but then you receive another error message when opening the file. So you prolly have to use the Students Software.

Running Scripts

To execute a script on the TI-Nspire:

1. Navigate to the script on your handheld.
2. Press ctrl+r to run the script.
3. Follow the on-screen prompts to input numbers and observe the output.

TODO

• Implement an option to abort the running script e.g. with ctrl+c
• Make the main-loops consistent, so every script has the same structure
• Rewrite the scripts in program editor, so they can also be used on the older CX-Version (will prolly never happen)
• Would be cool if all scripts are combined in a single script. E.g. a menu in which you can select a script and if the script has run through, you jump back to the menu.

Additional scripts TODO

• Make a RSA script based on the multiplicative_inverse.py that takes the given keys as input and calculates everything else
• Enhance the binary_decimal.py so it solves the exercise in the exam 1:1

Informationstheorie:

• Entscheidungsgehalt
• Informationsgehalt
• Entropie
• Redundanz der Quelle
• Mittlere Codewortlänge
• Redundanz des Codes
• Maximierung Entropie

Kanalmatrix:

• Berechnung der Kanalmatrix
• Berechnung der Eingangswahrscheinlichkeiten
• Berechnung der Ausgangswahrscheinlichkeiten
• Entropie am Kanaleingang H(X)
• Entropie am Kanalausgang H(Y)
• Transinformation
• Maximale Symbolrate

Blockcodes:

• Hammingdistanz
• Anzahl möglicher/gültiger Codewörter
• Dichtgepacktheit eines Codes
• Schnelle Mehrfachaddition