You can get ROOT 4.01/04 binaries for RH7.3/gcc2.96 from http://root.cern.ch/root/Version401.html As I said in my mail, the [cutg] option was implemented only in 4.01/04. If you have problems installing the binaries (or compiling from source) on your platform, please let us know. Rene Brun ddas@veccal.ernet.in wrote: > > Hi rene > > thanks, I am using linux 7.3 ------------ > > Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/2.96/specs > gcc version 2.96 20000731 (Red Hat Linux 7.3 2.96-110) > > with this version of gcc. will it work? > earlier i had problems in indtalling 4.00 and so still working with 3.10 the old version. > regards > > > To use the [cut] option in Projections, you must use a recent > > version like > > 4.01/04 > > > > Rene Brun > > > > ddas@veccal.ernet.in wrote: > > > > > > Hello > > > does anybody know how to project subrange of a 2D histogram. > > > I tried using TCutG but somehow could not get the result. > > > I wanted to change by Projection X from value1 to value2 and > > then plot that part only. > > > Also if somebody can explain what this SetPoint means. > > > > > > Example: > > > > > > { > > > TCanvas *c = new TCanvas("c","example",0,0,700,600); > > > c->Divide(1,2); > > > > > > TCutG *gcut = new TCutG("gcut",8); > > > gcut->SetPoint(0,-0.646552,0.932203); > > > gcut->SetPoint(1,-1.26437,0.105932); > > > gcut->SetPoint(2,-0.574713,-1.10169); > > > gcut->SetPoint(3,0.948276,-0.338983); > > > gcut->SetPoint(4,1.07759,0.720339); > > > gcut->SetPoint(5,-0.316092,-0.0847458); > > > gcut->SetPoint(6,-0.45977,0.402542); > > > gcut->SetPoint(7,-0.646552,0.932203); > > > > > > TFile f("hsimple.root") > > > TH2F *hpxpy = (TH2F*)f.Get("hpxpy"); > > > TH1D *hppx = hpxpy->ProjectionX("",1,40,"[gcut]"); > > > > > > c->cd(1); > > > hpxpy->SetFillColor(kBlue); > > > hpxpy->DrawCopy("box"); > > > hpxpy->SetFillColor(kRed); > > > hpxpy->Draw("same box [gcut]"); > > > > > > c->cd(2); > > > hppx->Draw(); > > > } > > > > > > thanks again > > > debasish. > > > > > > > > > >
This archive was generated by hypermail 2b29 : Sun Jan 02 2005 - 05:50:10 MET