Hi Stas, try tr->Branch("data",data,"data[100]/F",1024); That should work. If you want a dynamic array in your tree you can do it like this: TRandom gen; int na; float* af; TTree* tree = new TTree( "tree", "ROOT test tree" ); TBranch* brna= tree->Branch( "na", &na, "na/I", 8000 ); TBranch* braf= tree->Branch( "af", af, "af[na]/F", 8000 ); for( int i= 0; i < 10; ++i ) { na= gen.Gaus( 10.0, 3.0 ); af= new float[na]; for( int j= 0; j < na; ++j ) af[j]= gen.Gaus( 5.0, 10.0 ); braf->SetAddress( &af[0] ); tree->Fill(); delete[] af; } Note the use of the braf->SetAddress( &af[0] ) function to make shure the branch knows where to find the array in case it has changed. cheers, Stefan ---Stefan Kluth---------------Lynen Fellow----------------|\--|\------- - LBNL, MS 50A 2160 - phone: +1 510 495 2376 - |/ |/ - - 1 Cyclotron Rd. - fax: +1 510 495 2957 - |\/\|\/\|' - ---Berkeley, CA94720, USA-----e-mail: SKluth@lbl.gov------|/\/|/\/|----
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