Tree tutorials

Example code which illustrates how to use ROOT trees and ntuples.

Collaboration diagram for Tree tutorials:

Files
file	basic.C
	Read data from an ascii file and create a root file with an histogram and an ntuple.
file	basic2.C
	Create can ntuple reading data from an ascii file.
file	bill.C
	Benchmark comparing row-wise and column-wise storage performance.
file	cernbuild.C
	Read data (CERN staff) from an ascii file and create a root file with a Tree.
file	cernstaff.C
	Playing with a Tree containing variables of type character.
file	circular.C
	Example of a circular Tree.
file	clonesA_Event.C
	Example to write & read a Tree built with a complex class inheritance tree.
file	copytree.C
	Copy a subset of a Tree to a new Tree.
file	copytree2.C
	Copy a subset of a Tree to a new Tree, one branch in a separate file.
file	copytree3.C
	Example of Root macro to copy a subset of a Tree to a new Tree, selecting entries.
file	drawsparse.C
	Convert a THnSparse to a TTree using efficient iteration through the THnSparse and draw a THnSparse using TParallelCoord.
file	h1analysis.C
	Example of analysis class for the H1 data.
file	h1analysisProxy.C
	Example of analysis class for the H1 data using code generated by MakeProxy.
file	hsimpleReader.C
	TTreeReader simplest example.
file	htest.C
	Save histograms in Tree branches.
file	hvector.C
	Write and read STL vectors in a tree.
file	jets.C
	Usage of a Tree using the JetEvent class.
file	ntuple1.C
	Simple tree analysis.
file	parallelcoordtrans.C
	Use of transparency with ||-Coord.
file	printSizes.C
	This macro can be used to get aggregate information on the size take on disk or in memory by the various branches in a TTree.
file	spider.C
	TSpider example.
file	staff.C
	Create a plot of the data in cernstaff.root.
file	tcl.C
	How to write a TClonesArray to a TTree.
file	tree.C
	Display the Tree data structures.
file	tree1.C
	This example is a variant of hsimple.C but using a TTree instead of a TNtuple.
file	tree2.C
	This example illustrates how to make a Tree from variables or arrays in a C struct.
file	tree2a.C
	This example is the same as tree2.C, but uses a class instead of a C-struct.
file	tree3.C
	Example of a Tree where branches are variable length arrays A second Tree is created and filled in parallel.
file	tree4.C
	This example writes a tree with objects of the class Event.
file	treefriend.C
	Illustrates how to use Tree friends: