Hi Kalen,
You can force your own range with something like:
{
TCanvas *c1 = new TCanvas("c1");
c1->DrawFrame(0,0,480,1);
Int_t n = 7;
Double_t ecm[n];
Double_t nlr[n];
ecm[0]=350 ; nlr[0]=0.80703;
ecm[1]=370 ; nlr[1]=0.781981;
ecm[2]=390 ; nlr[2]=0.762459;
ecm[3]=410 ; nlr[3]=0.740626;
ecm[4]=430 ; nlr[4]=0.718904;
ecm[5]=450 ; nlr[5]=0.698587;
ecm[6]=470 ; nlr[6]=0.677837;
TGraph *theplot = new TGraph(n, ecm, nlr);
theplot -> Draw("L");
}
Rene Brun
On Wed, 7 Jan 2004, Kalen
Martens wrote:
> Hi Rene,
>
> For example, I want to generate a graph with the following script:
>
> {
> gROOT -> Reset();
>
> Int_t n = 7;
>
> Double_t ecm[n];
> Double_t nlr[n];
>
> ecm[0]=350 ; nlr[0]=0.80703;
> ecm[1]=370 ; nlr[1]=0.781981;
> ecm[2]=390 ; nlr[2]=0.762459;
> ecm[3]=410 ; nlr[3]=0.740626;
> ecm[4]=430 ; nlr[4]=0.718904;
> ecm[5]=450 ; nlr[5]=0.698587;
> ecm[6]=470 ; nlr[6]=0.677837;
>
> TGraph *theplot = new TGraph(n, ecm, nlr);
> theplot -> Draw("AL");
> }
>
> I obtain a graph, but it doesn't include the orgin. I can fix this (in
> the y-direction only) by including a line before the graph is drawn:
>
> theplot -> SetMinimum(0);
>
> However, it seems I cannot do the same for the x-direction (axis). I was
> wondering if there was a way to do that.
>
> I hope this makes my question more clear. I'm using ROOT 3.10-02.
>
> -Kalen
>
> -----------------------------------------------------------------
>
> On Wed, 7 Jan 2004, Rene Brun wrote:
>
> > Hi Kalen,
> >
> > I do not understand this problem. Could you send me the shortest
> > possible script reproducing it? Which version are you using?
> >
> > Rene Brun
> >
> > On Wed, 7 Jan
> > 2004, Kalen Martens wrote:
> >
> > >
> > > I have created a TGraph object from two arrays of Double_t data. All of
> > > the data is in the 1st quadrant. When I do a TGraph::Draw(), the graph is
> > > displayed nicely except that the zeroes are not included on the axes. I
> > > found that by using TGraph::SetMinimum() I can change the boundaries of
> > > the graph in the y-direction to include zero. However, I cannot see a way
> > > to achieve the same thing in the x-direction. Is there a way to do this?
> > >
> > > Many thanks in advance,
> > > -Kalen
> > >
> > > -----------------------------------------------------------------
> > > - Kalen Martens Ph:(416)-978-6632 -
> > > - Dept. of Physics -
> > > - University of Toronto, Toronto, Canada -
> > > -----------------------------------------------------------------
> > >
> >
>
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