This are the updated versions of the scripts chiFit.py and chi2FitXYErr.py used in physics at University of Bonn.

Requirements / How to install

Those scrips need to be executed usnig a terminal (Windows PowerShell, MacOS Terminal or Linux).
You'll need an installation of Python3 on your System as well as some additional packages
Needed packages:

• numpy
• matplotlib
• scipy

Use pip3 install -r requirements.txt to install all packages at once recursively.
Please consider using a virtual environment when installing python packages on your system.
Otherwise you're installing those packages globaly on your system which is a potential security flaw!

More Information

For more information on how to install packages using pythons own package manager pip and a terminal read the official documentation
It's highly recommended to use a linux terminal, please have in mind that Windows added support for the Linux Kernel with Windows-Subsystem for Linux WSL.
Install python3 on linux: apt-get install python3
Please have in mind that you may need sudo rights and the package manager might vary depending on your distro.

Troubleshooting

There is a common mistake when installing python3:
Set the checkmark on add python to PATH on the first dialogue page of the python3 installer. Otherwise pip will not work as expected.
If you didn't set that checkmark or get some errors with pip anyways, try the following commands:
py -m pip install --upgrade pip
py -m pip install SomePackage
Notice: When using a Linux or macOS you need to use python3 {...} instead of py {...}

Matplotlib isn't available for python 3.9 yet (current date: 31.10.2020), please keep this in mind when choosing your version of python3.

How to use

• Navigate inside the terminal to the folder your python scripts are loacated in cd {directory} works in all terminals mentioned above.
• Execute the script by using py {script} or python3 {script}
• If you don't know how to use them try python3 {script} -h this should give you all needed information.

There is also an example file values.txt included that shows how to format your data for correct usage.

Please don't forget to read and understand the code eventhough it's from an official source and easy to use!
You can't trust any code you on the internet if you don't understand whats going on!

Contibutors:
Thomas Erben
Christoph Geron
pbechtle