Just a quick question. I was asked to do a set of things with ROOT to create a macro:
- Create histogram using this command TH1F *h = new TH1F(“h”, “h”, 60,0,60);
- Open a root file
- Then from flasher in this root file use Draw function to draw om number in this histogram under the condition that we have string number 62 and om number 2
- Use command GetEntries() to get number of events
Now I created the histogram with that TH1F command, then I opened the ROOT file with TFile…after that though I don’t know how to use the Draw function. I can seperately do mytree->Draw(…) but how do I get that plot into my *h histogram I created? That way when I input h.Draw() I will see the plot of my unique histogram that has the required conditions. Step 4 is simple but step 3 is confusing.
I can draw the histogram and have it printed out, but how do i have it saved into my TH1F historgram? is it just a simple command? like something that needs to be put into the parentheses?
Thanks in advance