Copying TTrees

Hello,

I am trying to do the following, but can't seem to figure it out. I have two files (file1 and file2) and each has a tree of the same name ("results"). I would like to make a new file (file3) which has two trees in it, each with different names, but which are just copies of the trees in file1 and file2. Essentially I want to merge file1 and file2 into a new file with two trees. Here's what I tried:

  TFile* outputFile = TFile::Open("allData.root", "RECREATE" );   TFile* inputFile1 = TFile::Open("file1.root","READ");   TTree *t1 = (TTree*)inputFile1->Get("results");   TFile* inputFile2 = TFile::Open("file2.root","READ");   TTree *t2 = (TTree*)inputFile2->Get("results");   outputFile->WriteObject(t1,"newTreeName1");   outputFile->WriteObject(t2,"newTreeName2");

When I do this and look at the output file in a TBrowser it appears to have worked, however when I then try to draw any of the variables in either tree I get errors like these:
Error in <TFile::ReadBuffer>: error reading all requested bytes from file allData.root, got 0 of 10716

Can anyone explain the proper way to merge these trees into one file? Thanks,

-Dan Received on Fri May 20 2011 - 04:04:21 CEST