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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