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.
> > >
> > >
> >
> >
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