Dear Rooters
At the beginning of my program I open a file "OldFile.root",
which contains many trees, in READ mode, and I create a new
file "NewFile.root".
Then I do the following:
1. Get one tree from OldFile and add the other trees as friend.
2. Do some calculation with the tree data
3. Create new trees and store these trees in file NewFile.root
However, at a later point I want to add one of the new trees,
stored in NewFile, as an additional friend to the existing
list of tree friends.
Sorrowly, the following line:
tree->AddFriend(aliasname, "/path/NewFile.root");
or the line
tree->AddFriend(aliasname, "NewFile.root");
creates the following error messages:
Warning in <TFile::Init>: file /path/NewFile.root has no keys
Warning in <TTree::AddFriend>: Unknown Tree alias=treename.exten
in file /path/NewFile.root
My question is:
How can I add a newly created tree to an already existing list
of tree friends?
Thank you in advance for your help.
Best regards
Christian
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