Reading asc file in 2D histogram

ROOT
1

Hello
This file given below is the file for read an “asc” file named foo.asc. But I need 2D histogram. One axis contains foo.asc data and the other contain, say, foo2.asc. Is there a way to do this?

Best wishes,

Serkan

#include
#include
// #include

#include “TH1.h”

void readasc()
{

vector<Float_t> dat;
ifstream in;
in.open(“foo.asc”);

//read file
while( in.good() )
{
Double_t num;
in >> num;
// std::cout << “in.fail():” << in.fail() << “; num=” << num << std::endl;
if( in.fail() )
break;
dat.push_back(num);
}

// fill histo
Int_t numbins = dat.size();
TH1F* h = new TH1F(“h1”,“h1”, numbins, 0, numbins );
for ( Int_t i=0; i != numbins; ++i )
{
h->SetBinContent( i+1, dat.at(i) );
h->SetEntries( h->GetEntries()+i );
}

//draw histo
h->Draw();

}

foo.asc.tar.gz (146 Bytes)

2

Hi,

you could do it once for X, once for Y, and then fill the histogram.

Axel.

3

In the same code?
Thank you

4

Hi,

yes, why not? You’ll need two vectors of course, say “datX” and “datY”.

Axel.

5

Thank you so much, it works :slight_smile:

Best wishes to you