+ if (save)
+ proj->Write();
+}
+
+//____________________________________________________________________
+void AliPWG0Helper::CreateDividedProjections(TH3* hist, TH3* hist2, const char* axis, Bool_t putErrors, Bool_t save)
+{
+ // create projections of the 3d hists divides them
+ // axis decides to which plane, if axis is 0 to all planes
+ // the histograms are not returned, just use them from memory or use this to create them in a file
+
+ if (axis == 0)
+ {
+ CreateDividedProjections(hist, hist2, "yx", putErrors, save);
+ CreateDividedProjections(hist, hist2, "zx", putErrors, save);
+ CreateDividedProjections(hist, hist2, "zy", putErrors, save);
+
+ return;
+ }
+
+ TH1* proj = hist->Project3D(axis);
+
+ if (strlen(axis) == 2)
+ {
+ proj->SetYTitle(GetAxisTitle(hist, axis[0]));
+ proj->SetXTitle(GetAxisTitle(hist, axis[1]));
+ }
+ else if (strlen(axis) == 1)
+ proj->SetXTitle(GetAxisTitle(hist, axis[0]));
+
+ TH1* proj2 = hist2->Project3D(axis);
+ if (strlen(axis) == 2)
+ {
+ proj2->SetYTitle(GetAxisTitle(hist2, axis[0]));
+ proj2->SetXTitle(GetAxisTitle(hist2, axis[1]));
+ }
+ else if (strlen(axis) == 1)
+ proj2->SetXTitle(GetAxisTitle(hist2, axis[0]));
+
+ TH1* division = dynamic_cast<TH1*> (proj->Clone(Form("%s_div_%s", proj->GetName(), proj2->GetName())));
+ //printf("doing axis: %s, x axis has %d %d bins, min %f %f max %f %f\n", axis, division->GetNbinsX(), proj2->GetNbinsX(), division->GetXaxis()->GetBinLowEdge(1), proj2->GetXaxis()->GetBinLowEdge(1), division->GetXaxis()->GetBinUpEdge(division->GetNbinsX()), proj2->GetXaxis()->GetBinUpEdge(proj2->GetNbinsX()));
+ //printf("doing axis: %s, y axis has %d %d bins, min %f %f max %f %f\n", axis, division->GetNbinsY(), proj2->GetNbinsY(), division->GetYaxis()->GetBinLowEdge(1), proj2->GetYaxis()->GetBinLowEdge(1), division->GetYaxis()->GetBinUpEdge(division->GetNbinsY()), proj2->GetYaxis()->GetBinUpEdge(proj2->GetNbinsY()));
+ division->Divide(proj, proj2, 1, 1, "B");
+ division->SetTitle(Form("%s divided %s", proj->GetTitle(), proj2->GetTitle()));
+
+ if (putErrors)
+ {
+ division->Sumw2();
+ if (division->GetDimension() == 1)
+ {
+ Int_t nBins = division->GetNbinsX();
+ for (Int_t i = 1; i <= nBins; ++i)
+ if (proj2->GetBinContent(i) != 0)
+ division->SetBinError(i, TMath::Sqrt(proj->GetBinContent(i)) / proj2->GetBinContent(i));
+ }
+ else if (division->GetDimension() == 2)
+ {
+ Int_t nBinsX = division->GetNbinsX();
+ Int_t nBinsY = division->GetNbinsY();
+ for (Int_t i = 1; i <= nBinsX; ++i)
+ for (Int_t j = 1; j <= nBinsY; ++j)
+ if (proj2->GetBinContent(i, j) != 0)
+ division->SetBinError(i, j, TMath::Sqrt(proj->GetBinContent(i, j)) / proj2->GetBinContent(i, j));
+ }
+ }
+
+ if (save)
+ {
+ proj->Write();
+ proj2->Write();
+ division->Write();
+ }
+}
+
+//____________________________________________________________________
+const char* AliPWG0Helper::GetAxisTitle(TH3* hist, const char axis)
+{
+ // returns the title of the axis given in axis (x, y, z)
+
+ if (axis == 'x')
+ return hist->GetXaxis()->GetTitle();
+ else if (axis == 'y')
+ return hist->GetYaxis()->GetTitle();
+ else if (axis == 'z')
+ return hist->GetZaxis()->GetTitle();
+
+ return 0;