Making histogram from text file

Newbie
1

Hello everyone.
I am trying to generate a histogram from my data file but the data files contains a lot colums and I want to read data one by one.

For example:
2 4 5
5 7 0
6 1

And I want to read data and fill the histogram start 2,4,5,5,7 and so on…

I am trying this:

void Plotting(){

TH1F *h = new TH1F(“h”, “histogram”,1000,5.,9.);
ifstream inp; double x;

inp.open(“data.dat”);
for (int i=1; i<=1000; i++) {
inp >> x;
h->SetBinContent(i,x);
}
h->Draw();
}

I am afraid that I am only reading the first column. Can someone help me how I can read all values one by one?

3

It looks like your “data file” contains variable length vectors, so you’d better contact the “author” of this file, who should be able to provide you with an appropriate “parser”.

4

I am actually generating the data files using a monte carlo program.

5

So, talk to people familiar with this “monte carlo program” (e.g., your colleagues and/or supervisor).

6

Okay. Thank you, I will do so.