//******************************************************************
//A little script to normalize two histograms using user input
//of file names and histogram names created with myAnalysis.cxx
//By Marshall Rogers, Columbia University, Nevis Laboratories 2010
//mar2194@columbia.edu (c) 2010
//******************************************************************


#include <iostream.h>
void normalize()

{
char file1[20];
fputs("enter the first file name: ", stdout);
if ( fgets(file1, 20, stdin) != NULL )
{
  char *newline = strchr(file1, '\n'); /* search for newline character */
  if ( newline != NULL )
    {
      *newline = '\0'; /* overwrite trailing newline */
    }
  printf("file1 = \"%s\"\n", file1);
 }


char file2[20];
fputs("enter the second file name: ", stdout);
if ( fgets(file2, 20, stdin) != NULL )
{
  char *newline = strchr(file2, '\n'); /* search for newline character */
  if ( newline != NULL )
    {
      *newline = '\0'; /* overwrite trailing newline */
    }
  printf("file2 = \"%s\"\n", file2);
 }
char histo[20];
fputs("enter the variable to plot: ", stdout);
if ( fgets(histo, 20, stdin) != NULL )
{
  char *newline = strchr(histo, '\n'); /* search for newline character */
  if ( newline != NULL )
    {
      *newline = '\0'; /* overwrite trailing newline */
    }
  printf("histo = \"%s\"\n", histo);
 }



TFile *f1=new TFile(file1);
TH1F *h1=f1->Get(histo);
h1->SetLineColor(2);
int n1=h1->GetEntries();
TFile *f2=new TFile(file2);
TH1F *h2=f2->Get(histo);
int n2=h2->GetEntries();
h2->SetLineColor(2);
h2->Scale(n1/n2);
h2->Draw();
h1->Draw("sames");

}