func tree0(f croot.File) {
t := f.GetTree("tree")
e := &Event{}
t.SetBranchAddress("evt", e)
// fill some events with random numbers
nevents := int64(*evtmax)
if nevents < 0 || nevents > int64(t.GetEntries()) {
nevents = int64(t.GetEntries())
}
for iev := int64(0); iev != nevents; iev++ {
if iev%1000 == 0 {
fmt.Printf(":: processing event %d...\n", iev)
}
if t.GetEntry(iev, 1) <= 0 {
panic("error")
}
if iev%1000 == 0 {
fmt.Printf("ievt: %d\n", iev)
fmt.Printf("evt.a.e= %8.3f\n", e.A.E)
fmt.Printf("evt.a.t= %8.3f\n", e.A.T)
fmt.Printf("evt.b.e= %8.3f\n", e.B.E)
fmt.Printf("evt.b.t= %8.3f\n", e.B.T)
}
}
}
func tree0(f croot.File) {
// create a tree
tree := croot.NewTree("tree", "tree", 32)
e := &Event{}
const bufsiz = 32000
tree.Branch("evt", e, bufsiz, 0)
// fill some events with random numbers
nevents := *evtmax
for iev := 0; iev != nevents; iev++ {
if iev%1000 == 0 {
fmt.Printf(":: processing event %d...\n", iev)
}
// the two energies follow a gaussian distribution
e.A.E = rand.NormFloat64() //ea
e.B.E = rand.NormFloat64() //eb
e.A.T = croot.GRandom.Rndm(1)
e.B.T = e.A.T * croot.GRandom.Gaus(0., 1.)
if iev%1000 == 0 {
fmt.Printf("ievt: %d\n", iev)
fmt.Printf("evt.a.e= %8.3f\n", e.A.E)
fmt.Printf("evt.a.t= %8.3f\n", e.A.T)
fmt.Printf("evt.b.e= %8.3f\n", e.B.E)
fmt.Printf("evt.b.t= %8.3f\n", e.B.T)
}
tree.Fill()
}
f.Write("", 0, 0)
}