Setting up ROOT
(5 minutes)
Before you start using ROOT, you often have to set it up:
- If you’re not using one of the Nevis particle-physics systems, hopefully you have received instructions on how to set up ROOT at your site. Now is the time to follow those directions. 
- If you had to install ROOT on your own you already know whatever special set-up you need on your local computer. 
- If you are using one of the particle-physics systems at Nevis, no special set-up is needed. 
Nevis specifics
There’s an alternative distribution of the ROOT software on the Nevis particle-physics systems that’s available with this command:
conda activate /usr/nevis/conda/root
This modifies your UNIX environment to use a more full-featured ROOT setup than I was able to install natively on our standard Linux installations. If you have difficulty running ROOT on your workgroup’s server, you may to try that conda command.
Working-group specifics
Even at Nevis, some physics groups work with software frameworks that have their own versions of ROOT built-in; e.g., Athena in ATLAS or LArSoft in MicroBooNE. If you’re working with such a framework, you’ll have a special set-up command to use.