Hi Kevin,
I am not sure that I understand completly your request.
Could you give an example of a "long cut" that does not work?
You can use: TTree::CopyTree to create a new Tree from an original Tree
with selections.
You can fill one or more TEventList and use a combination of TEventList
to make a new selection, etc.
See :
http://root.cern.ch/root/htmldoc/TTreePlayer.html#TTreePlayer:DrawSelect
http://root.cern.ch/root/htmldoc/TEventList.html
Rene Brun
On Wed, 13 Mar 2002, Kevin Reil wrote:
> Hi,
>
> I have an ntuple "x1:x2:x3:x4:x5:...:xn" and a list of cuts I wish to
> perform. I do not know in advance what n is but it is always larger than
> some minimum. If I create a very long string with all the cuts it does not
> work. Is there a quick and easy way to do something like
>
> TNtuple *nt;
> TNtuple *ntcut1;
> TNtuple *ntcut2;
> ...
> Open the file with nt
> ....
> ntcut1=nt->Clone("ntcut1","x1>5");
> ntcut2=ntcut1->Clone("ntcut2","x2<3");
>
> or
>
> nt->Draw(">>ntcut1","x1>5");
> ntcut1->Draw(">>ntcut2","x2<3");
>
> Or best yet
> ntcut1=nt->PerformCut("x1>5");
> ntcut2=ntcut1->PerformCut("x1>5");
>
> What I wish to avoid is having to code what is in the ntuple nt, create
> ntcut1 based on knowledge of nt.
> I am aware that I could SetAddress, GetEvent, decide, ntcut1->fill,
> etc. Of course, I need to form ntcut1-> to be fillable, create a structure
> to hold the proper x1:xn etc. I would prefer above methods.
>
>
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