Thomas, Your question is not clear. Do you mean "can" or "cannot" ? Any collection of objects can be written to a file (see TCollection::Write method). You have two ways -single key (all objects are serialized in teh same buffer) -one key per object in the collection (default). Obviously, each object in the collection must be streamable (have a dictionary). See for example this session: root [4] TObjArray a(3) root [5] a.Add(hpx) root [6] a.Add(hprof) root [7] a.Add(hpxpy) root [8] TFile f("junk.root","recreate") root [9] a.Write("a") (Int_t)4644 root [10] .ls TFile** junk.root TFile* junk.root KEY: TH2F a;3 py vs px KEY: TProfile a;2 Profile of pz versus px KEY: TH1F a;1 This is the px distribution root [11] a.Write("as",TObject::kSingleKey) (Int_t)4381 root [12] .ls TFile** junk.root TFile* junk.root KEY: TH2F a;3 py vs px KEY: TProfile a;2 Profile of pz versus px KEY: TH1F a;1 This is the px distribution KEY: TObjArray as;1 An array of objects Rene Brun On Wed, 15 Sep 2004, Thomas Bretz wrote: > Hi, > > is it possible that a TObjArray cannot be written to a file? I cannot > find anything about this in the documenation... > > Thomas. >
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