Two files to be one file

[BAJA]

if I have the two attached files, with the same X axes,
How can i make a new output file contain the same X and the sum of Y? and Draw the results in Histograme?

[Pnine]

Hi,

I think you need to read in the content of the files (this is not a root specific task) and then fill a histogram (you can educate yourself here I think https://root.cern.ch/doc/master/group__tutorial__hist.html)

Cheers

[couet]

I already send you an example which does the reading and writing of a two columns ascii file . Start from that. You only need to create a 1D histogram and fill it. The page @Pnine pointed gives you plenty of examples showing how to do this simple task.

[BAJA]

the last example with one input file, but here i have two input files. same X and different y, i want to generate anew file with X and the sum of Y

[couet]

Open the two file you need to read using:

   ifstream inputfile1;
   inputfile1.open("data1.txt");
   ifstream inputfile2;
   inputfile2.open("data2.txt");

[BAJA]

can you modify please ?

adding.C (375 Bytes)

[couet]

the loop should be:

   while (inputfile1 >> E1 >> C1) {
      inputfile2 >> E2 >> C2;
      C = C1+C2;
      outputfile << E1 << "               " << C <<endl;
   }

[BAJA]

Thanks Alot,