Hi Hucheng,
Here a small example. You can find more in the tutorials
{
// example of macro to read data from an ascii file and
// create an histogram
ifstream in;
in.open("basic.dat", ios::in);
Float_t x;
TH1F *h1 = new TH1F("h1","x distribution",100,-4,4);
while (1) {
in >> x;
if (!in.good()) break;
h1->Fill(x);
}
h1->Draw();
}
Rene Brun
Hucheng CHEN wrote:
>
> Hi, Rooters:
>
> I am a new rooter, I have one simple questions. For example, I have a simple
> data file, which includes one column of data. In PAW, I can read this data
> file to one vector, then fill this vector to one hisgram by command hfill.
>
> vec/read a a.dat
> hfill a 1
> h/pl 1
>
> Now in ROOT, how can I implement this simple task. Thank you very much.
>
> Regards,
>
> Hucheng
> -----------------------------------------------------------------
> ------------------------------ Hucheng CHEN
> _/_/_/_/ _/ _/ _/ Omega Group
> _/ _/ _/_/ _/ _/ Physics Department
> _/_/_/ _/ _/ _/ _/ Building 510
> _/ _/ _/ _/_/ _/ P. O. Box 5000
> _/_/_/_/ _/ _/ _/_/_/_/ Brookhaven National Laboratory
> Brookhaven National Laboratory Upton, NY 11973-5000
> ------------------------------ USA
> -------------------------------- Tel: 631-344-3468
> Home Phone: 631-344-1210 Fax: 631-344-5568
> URL: http://www.bnl.gov E-Mail: chc@bnl.gov
> -----------------------------------------------------------------
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