Make some calculations optional for HLT

[u/mrichter/AliRoot.git] / TRD / AliTRDseed.cxx

diff --git a/TRD/AliTRDseed.cxx b/TRD/AliTRDseed.cxx
index db169f3a46a158050694c0df89844b35115364e4..6a77664081e268f8f3d1e31026c5350604859af9 100644 (file)
--- a/TRD/AliTRDseed.cxx
+++ b/TRD/AliTRDseed.cxx
@@ -638,7 +638,7 @@ Float_t AliTRDseed::FitRiemanTilt(AliTRDseed * cseed, Bool_t terror)
     if (-params[2]*params[0] + params[1]*params[1] + 1 > 0) {
       Double_t rm1 = params[0] / TMath::Sqrt(-params[2]*params[0] + params[1]*params[1] + 1); 
       if (1.0/(rm1*rm1) - (x-x0) * (x-x0) > 0.0) {
-                               Double_t res = (x - x0) / TMath::Sqrt(1.0 / (rm1*rm1) - (x-x0)*(x-x0));
+                               Double_t res = (x - x0) / TMath::Sqrt((1./rm1-(x-x0))*(1./rm1+(x-x0)));
                                if (params[0] < 0) res *= -1.0;
                                dy = res;
       }