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====About ROOT====

ROOT [[https://https://root.cern/about/CERN]] is a software framework born at CERN, at the heart of the research on high-energy physics. Physicists use ROOT applications to analyze their data or to perform simulations.

====Installing ROOT in a Python Virtual Environment on LENGAU====

   -Access LENGAU and Connect via SSH
   -Sign in to **LENGAU** and establish an SSH connection to the **dtn** node.

====Initialize Conda (if needed)====
   
Ensure your **base Conda environment** is initialized:

  -If initialized, (base) will appear next to your user ID, indicating that your **.bashrc** file has been set up to load Conda automatically
  -If Conda is not initialized, follow the instructions in the[[ https://wiki.chpc.ac.za/guide:python?s[]=*python*|CHPC Python Guide]].

====Prepare the Shell and Load Required Modules==== 

Purge any loaded modules and load the **BIOMODULES** module:
  
   module purge
   module add chpc/BIOMODULES
   
====Create a New Conda Environment with ROOT====
  conda create -n root_env root -c conda-forge
  
====Verify the Installation====
  conda info --envs
  conda list

====Activate the ROOT Environment====
  conda activate root_env
 
====Launch ROOT====
  root
 
====Deactivate the Environment when done====
  conda deactivate
  
=====Batch Scripts Example=====
This is just a simple example which will be improved as testing commences: 
<file bash root.qsub>
#!/bin/bash 
#PBS -P projectid
#PBS -l select=3:ncpus=24:mpiprocs=24:nodetype=haswell_reg
#PBS -q normal
#PBS -l walltime=01:00:00
#PBS -o /mnt/lustre/users/username/rootJobs/job01/stdout
#PBS -e /mnt/lustre/users/username/rootJobs/job01/stderr
#PBS -m abe
#PBS -M username@email.co.za
### Activate the conda ROOT environment: 
 conda activate root_env
##### Running commands
# Set this environment variable explicitly.
export PBS_JOBDIR=/mnt/lustre/users/username/rootJobs/job01
# Explicitly change to the job directory
cd $PBS_JOBDIR
nproc=`cat $PBS_NODEFILE | wc -l`
exe=root
mpirun -np $nproc $exe > root.out
</file>
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