Difference between revisions of "ROOT Tips and Tricks"
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1. Make the plot | 1. Make the plot | ||
| − | 2. Draw the graphical cut either by using the toolbar at the top of the screen under Edit, or by hard-coding it into your script, via: | + | 2. Draw the graphical cut either by using the toolbar at the top of the screen under Edit->Toolbar->GraphicalCut (scissors), or by "hard-coding" it into your script, via: |
| − | //snipped | + | //snipped; this code has the computer wait for you to draw the cut. |
TCutG* cutg; | TCutG* cutg; | ||
cutg=(TCutG*)gPad->WaitPrimitive("CUTG","CutG"); // making cut, store to CUTG | cutg=(TCutG*)gPad->WaitPrimitive("CUTG","CutG"); // making cut, store to CUTG | ||
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4. In command line: | 4. In command line: | ||
| − | $ TFile f("filename.root","recreate"); | + | $ TFile f("filename.root","recreate"); //reconstructs the cut |
| − | $ mycut.Write(); | + | $ mycut.Write(); //saves the cut to "filename.root" |
4. In a new session/macro: | 4. In a new session/macro: | ||
Latest revision as of 16:06, 20 July 2009
Add any useful code snippets, hints, tutorials, etc you use here!
How to save a graphical cut and implement it in another script:
1. Make the plot
2. Draw the graphical cut either by using the toolbar at the top of the screen under Edit->Toolbar->GraphicalCut (scissors), or by "hard-coding" it into your script, via:
//snipped; this code has the computer wait for you to draw the cut.
TCutG* cutg;
cutg=(TCutG*)gPad->WaitPrimitive("CUTG","CutG"); // making cut, store to CUTG
c1->Update(); //update the canvas
TCutG *tmpg, *mycutg;
tmpg = (TCutG*)gROOT->GetListOfSpecials()->FindObject("CUTG");
mycutg = (TCutG*)(tmpg->Clone("mycutg"));
//NOTE: It is important to update the canvas where specified!
3. Now, save as "mycut" (right-click on the cut->SetName)
4. In command line:
$ TFile f("filename.root","recreate"); //reconstructs the cut
$ mycut.Write(); //saves the cut to "filename.root"
4. In a new session/macro:
TFile f("filename.root");
TCutG* mycut = (TCutG*)gRoot->FindObject("mycut");
5. Apply cut as you would if it were a TString.
