groups

name language licence
Untitled Snippet Other Other
Command line arguments C++ Other
Read data from a file C++ Other
Merging trees using a TChain C++ Other
Sort a tree C++ Other
TTree Scan column size Other Other
Untitled Snippet Other Other
Event processed Other Other

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language: C++
licence: Other

Sort a tree

options: view full snippet • send to code collector 
void sort() {

	TFile f("hsimple.root");
	TTree *tree = (TTree*)f.Get("ntuple");
	Int_t nentries = (Int_t)tree->GetEntries();
	//Drawing variable pz with no graphics option.
	//variable pz stored in array fV1 (see TTree::Draw)
	tree->Draw("pz","","goff");
	Int_t *index = new Int_t[nentries];
	//sort array containing pz in decreasing order
	//The array index contains the entry numbers in decreasing order
	// of pz
	TMath::Sort(nentries,tree->GetV1(),index);
	
	//open new file to store the sorted Tree
(Continues...)