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CERN/ROOT tips

Compiling with GCC

I could compile "foo.cxx" with GCC in online:

$ gcc $(root-config --cflags --libs) -o foo foo.cxx

EventList to make faster reading from TTree

This is original site: Masuoka's web site "To make tree wit gating by TEventlist".

	TTree *tr = (load some tree);
	tr->Draw(">> _good", TCut("some cut"));
	TEventList *evlist = gDirectory->Get("_good");
	tr->SetEventList(evlist);
	tr->Draw("var0");
	tr->Draw("var1");

This is same with:

	TTree *tr = (load some tree);
	tr->Draw("var0", TCut("some cut"));
	tr->Draw("var1", TCut("some cut"));