Glossary

Key Points

Introduction	C++ has a reputation for being intimidating, but there are only a few things you need to learn to edit the open data code for your own uses. You can use the ROOT toolkit using both C++ and python. Some ROOT code is written in C++ to access the datafiles. People will often use simpler C++ scripts or python scripts to analyze reduced datasets.
Lightning overview of C++	We must compile our C++ code before we can execute it.
Using ROOT with C++ to write and read a file	ROOT defines the file format in which all of the CMS Open Data is stored. These files can be accessed quickly using C++ code and the relevant information can be dumped out into other formats.
Using ROOT with C++ to fill a histogram	You can quickly inspect your data using just ROOT A simple ROOT script is often all you need for diagnostic work
Using ROOT with python	PyROOT is a complete interface to the ROOT libraries

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