TTree::ReadFile() branchdescriptor in file

[amaier]

Dear Root fans,

I am trying to read out the following test.txt file with data

these:are:my:branch:names
1 2 3 4 5
2 4 6 8 10
11 12 13 14 15
12 14 16 18 110
21 22 23 24 25
22 24 26 28 210

with this code:

TTree *t = new TTree()
t->ReadFile("test.txt")
t->Print()

but what I get is not a tree filled with the five branches these,are,my,branch and names each containing 6 entries, but the following error message and a tree that only contains three branches named x,y and z.

Warning in TTree::ReadStream: Couldn’t read formatted data in “these:are:my:branch:names” for branch x on line 1; ignoring line
Warning in TTree::ReadStream: Read too few columns (1 < 3) in line 1; ignoring line
Warning in TTree::ReadStream: Ignoring trailing " 4 5" while reading line 2
Warning in TTree::ReadStream: Ignoring trailing " 8 10" while reading line 3
Warning in TTree::ReadStream: Ignoring trailing " 14 15" while reading line 4
Warning in TTree::ReadStream: Ignoring trailing " 18 110" while reading line 5
Warning in TTree::ReadStream: Ignoring trailing " 24 25" while reading line 6
Warning in TTree::ReadStream: Ignoring trailing " 28 210" while reading line 7

It seems like the branchdescriptor cannot be read from the file this way and the maximum number of columns (branches) is 3. The documentation clearly states, that in case there is no branchdescriptor and deliminter given as argument, it will take the first line of the file as branchdescriptors and use space as deliminter. Am I missing something?

[amaier]

I’ve solved it, sorry for the inconvenience. It works fine with doing

TTree *t = new TTree(“t”,“t”)

instead of

TTree *t = new TTree()

This thread is useless now, please delete it if you agree.