SetBranchStatus

ROOT
1

Hi,

Is there a way to specify pattern so that TTree::SetBranchStatus(pattern,0) would set the status to 0 for branches not matching the pattern ?

Thanks,

2

Not directly.
I suspect the following should work:tree->SetBranchStatus("*",0); tree->SetBranchStatus(pattern,1);

Cheers,
Philippe

3

Hi,

Yes, but I was trying to find if there’s a way to minimize the number of times you have to loop over all branches…

4

[quote]Yes, but I was trying to find if there’s a way to minimize the number of times you have to loop over all branches…[/quote]The SetBranchStatus should be done only once per TTree (so it should not be significant).
Also the pattern matching is done on the branch name using a TRegexp object so you might be able to write a negative pattern …

Philippe

5

Well, the problem is that in our framework (AliRoot), we do have one Tree per event, with a single entry, so the overhead of the branch selection is not negligible…

This was my original question, in fact : how to write a negative pattern :wink: ?
[/quote]

6

[quote]This was my original question, in fact : how to write a negative pattern[/quote]Depends on your pattern of course :slight_smile:.
For example if you want to set zero for all the branch not match ‘a.’, you could write '[^a].’

Philippe

7

What about MUONLocalTrigger ?

8

I guess you mean all but the MUONLocalTrigger branch?

Philippe

9

Yes, sorry.

I indeed would like to disable all branches but “MUONLocalTrigger*” ones, and also all but “MUONDigits*” ones.

10

Ok, in this case (it seems you only want 2 read 2 top level branches) it might be more efficient/safe to forgo using SetBranchStatus and replacemytree->GetEntry(i);bytentry = mychain->LoadTree(i); pointer_to_MUONLocalTrigger_branch->GetEntry(tentry);

Cheers,
Philippe