This lesson is still being designed and assembled (Pre-Alpha version)

Computing Basics for DUNE - Late 2024 edition: Use Conda to install root

Installing conda and root

This is derived from the excellent https://iscinumpy.gitlab.io/post/root-conda/ by Henry Schreiner

Currently this has been tested on OSX and Linux distributions SL7 and AL9

Download miniconda

  1. Do you have wget on your system? If not, get it

  2. Download the miniconda installer

# Download the Linux installer
wget -nv http://repo.continuum.io/miniconda/Miniconda3-latest-Linux-x86_64.sh -O miniconda.sh

# Or download the macOS installer
wget -nv https://repo.anaconda.com/miniconda/Miniconda3-latest-MacOSX-x86_64.sh -O miniconda.sh

Install conda

# Install Conda (same for macOS and Linux)
bash miniconda.sh -b -p $HOME/miniconda
  1. add this to your .bashrc or .profile to start it up when you log in
source $HOME/miniconda/etc/profile.d/conda.sh # Add to bashrc - similar files available for fish and csh

Making an environment with root in it

conda create -n my_root_env root -c conda-forge

This will take a while. In the end you have an environment which contains root and a lot of other useful things

You can repeat step 1 to make different conda enviroments.

Try out your new environment

To activate a particular environment you do:

conda activate my_root_env

First time you use your environment you can do

conda config --add --env channels conda-forge # only

the config command tells conda to use conda-forge as a default. You should now have a conda environment with root in it.

Testing

(my_root_env) wngr405-mac3:utilities schellma$ root
   ------------------------------------------------------------------
  | Welcome to ROOT 6.28/00                        https://root.cern |
  | (c) 1995-2022, The ROOT Team; conception: R. Brun, F. Rademakers |
  | Built for macosx64 on Mar 21 2023, 08:18:00                      |
  | From tag , 3 February 2023                                       |
  | With                                                             |
  | Try '.help'/'.?', '.demo', '.license', '.credits', '.quit'/'.q'  |
   ------------------------------------------------------------------

root [1] .q

To get out of root type

root> .q

Try this

root -l -q $ROOTSYS/tutorials/dataframe/df013_InspectAnalysis.C

You should see a plot that updates.