About ROOT

ROOT is installed on d0mino .

• To use it on d0mino:
  > setup n32
  
  > setup D0RunII d0release_version_number
  
  > root
  ...
  
  Type ? for help. Commands must be C++ statements.
  ...
  
  (use .q to quit from root)

  If you have a HBOOK format N-tuple file, you can convert it into a ROOT file by:

  > h2root myhbookfile myrootfile
  So HBOOK row-wise and column-wise ntuples are automatically converted to ROOT Trees in the myrootfile.

  Here is an example on how to use ROOT to do a reproducible event analysis (provided by Chunhui Luo).

  An of example create and fill a histogram.

  If you have been using HepTuple package to store histograms or N-tuples into HBOOK format output in your C++ program, by simply changing HepHBookFileManager in your code to be HepRootFileManager you will get the histograms or N-tuples into ROOT format output.

ROOT new structure

ROOT at Fermilab:

• Fermilab ROOT Support Group has provided many ROOT trainning classes for D0. These are excellent classes. The Fermilab ROOT class instructors are invided to teach ROOT class world wide. The following web pages contain the ROOT class teaching materials and the instructor's slides.
  • The web page for ROOT Class 101.
  • The web page for ROOT Class 102.
• ROOT User's Guide can be downloaded from here.
• Document: Getting Started with ROOT is an excellent, short guide to get you started with ROOT.
• Document: C++ tutorial for ROOT Users is an excellent C++ refresher/primer for the person ready to dive into root, if you have no prior knowledege of C or C++, but are fluent in Fortran.
• The Fermilab ROOT mailing list is: about-root@fnal.gov. This list is dedicated to all discussion, gripe, information about ROOT at Fermilab. This is meant to be a way for Fermilab users of ROOT to share common experiences and receive relevant updates. If you want to discuss your ROOT related problems or questions with others, please send messages to about-root@fnal.gov. You can also subscribe to the list by sending mail to listserv@fnal.gov.
• An archive of about-root mails can be found here .

Using ROOT as Run II Physics Analysis Tool

• From Fermilab Joint Project Run II Steering Committee
• Run II Physics Analysis Software Recommendations Group (PASREC)
• Recommendation from CD/CDF/D0 joint group (PASREC)
• Technical Evaluation Reports on ROOT
• Evaluation of ROOT from users perspective (CDF)

ROOT: Executive Summary (from ROOT authors)

The ROOT system provides a set of OO frameworks with all the functionality needed to handle and analyse large amounts of data in a very efficient way. Having the data defined as a set of objects, specialised storage methods are used to get direct access to the separate attributes of the selected objects, without having to touch the bulk of the data. Included are histograming methods in 1, 2 and 3 dimensions, curve fitting, function evaluation, minimisation, graphics and visualization classes to allow the easy setup of an analysis system that can query and process the data interactively or in batch mode.