Hi! I've read <A HREF="http://root.cern.ch/root/roottalk/0676.html"> Marc Mueller's question</A>. I tried about the same, and I failed too. But if I create the 'ifstream' class with 'new', it seems to work, while I don't want to reset the interpreter with the '.reset' command. My macro is: { gROOT->LoadMacro("fstream.h"); TCanvas *c = new TCanvas("c", "The Hello Canvas", 400, 400); const Int_t NSLICES=512; Int_t h; Int_t value; TH1D *histogram[NSLICES]; Text_t hname[100]; for(h=0;h<NSLICES;h++) // creating histogram array { sprintf(hname,"h_%i",h); histogram[h]=new TH1D(hname,hname,71,109.5,170.5); } ifstream *input_file=new ifstream("data"); while(1) // fill histograms { *input_file>>h>>value; if(input_file->eof()) break; histogram[h]->Fill(value); } return; } After running this macro I can draw the histograms in the command line: histogram[100]->Draw(); But if I say '.reset' I get the following message: *** Break *** segmentation violation ( 0) 0xc0d3ede0 StackTrace__11TUnixSystemFv + 0x28 [/afs/cern.ch/na49/library/local/ROOT/root/lib/libUnix.sl] ( 1) 0xc0d3d8e8 DispatchSignals__11TUnixSystemF8ESignals + 0x150 [/afs/cern.ch/na49/library/local/ROOT/root/lib/libUnix.sl] ( 2) 0xc0d3c5c0 SigHandler__F8ESignals + 0x28 [/afs/cern.ch/na49/library/local/ROOT/root/lib/libUnix.sl] ( 3) 0xc0d407f8 sighandler__Fi + 0x58 [/afs/cern.ch/na49/library/local/ROOT/root/lib/libUnix.sl] ( 4) 0xc012f2e0 _sigreturn [/usr/lib/libc.1] and so on. What's wrong with this macro? Thanks Daniel
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