Hi Steffen,
a running example. See below files stime.C and stime.dat
Rene Brun
//file stime.C
void stime() {
ifstream in;
in.open("stime.dat", ios::in);
int h,m,s;
const int nmax=1000;
double seconds[nmax], bincount[nmax];
int ntimes = 0;
char ctime[10];
while (1) {
in >> ctime >> bincount[ntimes];
if (!in.good()) break;
sscanf(ctime,"%d:%d:%d",&h,&m,&s);
seconds[ntimes] = s +60*m +3600*h;
ntimes++;
}
in.close();
TCanvas *c1 = new TCanvas("c1");
c1->SetGrid();
TGraph *gr = new TGraph(ntimes,seconds,bincount);
gr->SetMarkerStyle(21);
gr->Draw("alp");
c1->Update(); //force creation of frame histogram
gr->GetHistogram()->GetXaxis()->SetTimeDisplay(1);
c1->Modified();
}
//file stime.dat
0:00:00 771
0:00:05 759
0:00:10 751
0:00:15 756
0:00:20 752
0:00:25 763
0:00:30 745
0:00:35 742
0:00:40 745
0:00:45 742
0:00:50 750
0:00:55 751
0:01:00 739
Steffen Grohmann wrote:
>
> Dear Rene,
>
> I would like to know the code for reading the file, especially the time
> column, and allocate the values of the time string ("hh:mm:ss") to a
> time variable, which then can be used for scaling the x-axis
> (SetTimeDisplay etc...).
>
> Of course, I could generate the time scale with a certain time interval
> directly in ROOT, but this only works for a constant interval between
> all the data.
>
> In my case data might have been recorded in arbitrary time intervals,
> which need to be read from the data file.
>
> Regards, Steffen
>
> Rene Brun wrote:
> >
> > Hi Steffen,
> >
> > Could you clarify your request?
> > Do you want the code to read this file or simply label
> > your x axis with a time format?
> > eg;
> >
> > TH1F h("h","test",13,0,65);
> > h.GetXaxis()->SetTimeDisplay();
> > h.SetBinContent(1,771);
> > etc..
> > h.Draw();
> >
> > Rene Brun
> >
> > On Mon, 18 Mar 2002, Steffen Grohmann wrote:
> >
> > > Hello,
> > >
> > > I am looking for an option to read recoreded time values from an ascii
> > > file to be used in a histogram or graph (see example).
> > >
> > > Example file:
> > > 0:00:00 771
> > > 0:00:05 759
> > > 0:00:10 751
> > > 0:00:15 756
> > > 0:00:20 752
> > > 0:00:25 763
> > > 0:00:30 745
> > > 0:00:35 742
> > > 0:00:40 745
> > > 0:00:45 742
> > > 0:00:50 750
> > > 0:00:55 751
> > > 0:01:00 739
> > >
> > > Regards, Steffen
> > > --
> > >
> > > +------------------------------------------------------+
> > > |Steffen Grohmann steffen.grohmann@cern.ch |
> > > +------------------------------------------------------|
> > > |CERN |
> > > |European Organization for Nuclear Research |
> > > |ST Division |
> > > |CH-1211 Geneve 23 phone: +41 22 767-7079|
> > > |Switzerland fax: +41 22 767-8767|
> > > +------------------------------------------------------+
> > >
>
> --
>
> +------------------------------------------------------+
> |Steffen Grohmann steffen.grohmann@cern.ch |
> +------------------------------------------------------|
> |CERN |
> |European Organization for Nuclear Research |
> |ST Division |
> |CH-1211 Geneve 23 phone: +41 22 767-7079|
> |Switzerland fax: +41 22 767-8767|
> +------------------------------------------------------+
This archive was generated by hypermail 2b29 : Sat Jan 04 2003 - 23:50:46 MET