File indexing completed on 2024-04-06 12:29:07
0001 #include "RecoVertex/GaussianSumVertexFit/interface/VertexGaussianStateConversions.h"
0002
0003 #include "RecoVertex/GaussianSumVertexFit/interface/BasicMultiVertexState.h"
0004 #include "TrackingTools/GsfTools/interface/SingleGaussianState.h"
0005
0006 namespace GaussianStateConversions {
0007
0008 MultiGaussianState<3> multiGaussianStateFromVertex(const VertexState aState) {
0009 typedef std::shared_ptr<SingleGaussianState<3> > SingleStatePtr;
0010 const std::vector<VertexState> components = aState.components();
0011 MultiGaussianState<3>::SingleStateContainer singleStates;
0012 singleStates.reserve(components.size());
0013 for (std::vector<VertexState>::const_iterator ic = components.begin(); ic != components.end(); ic++) {
0014 if (ic->isValid()) {
0015 GlobalPoint pos(ic->position());
0016 AlgebraicVector3 parameters;
0017 parameters(0) = pos.x();
0018 parameters(1) = pos.y();
0019 parameters(2) = pos.z();
0020 SingleStatePtr sgs(new SingleGaussianState<3>(parameters, ic->error().matrix(), ic->weightInMixture()));
0021 singleStates.push_back(sgs);
0022 }
0023 }
0024 return MultiGaussianState<3>(singleStates);
0025 }
0026
0027 VertexState vertexFromMultiGaussianState(const MultiGaussianState<3>& multiState) {
0028 if (multiState.components().empty())
0029 return VertexState();
0030
0031 const MultiGaussianState<3>::SingleStateContainer& singleStates = multiState.components();
0032 std::vector<VertexState> components;
0033 components.reserve(singleStates.size());
0034 for (MultiGaussianState<3>::SingleStateContainer::const_iterator ic = singleStates.begin();
0035 ic != singleStates.end();
0036 ic++) {
0037 const AlgebraicVector3& par = (**ic).mean();
0038 GlobalPoint position(par(0), par(1), par(2));
0039 const AlgebraicSymMatrix33& cov = (**ic).covariance();
0040 GlobalError error(cov(0, 0), cov(1, 0), cov(2, 0), cov(1, 1), cov(2, 1), cov(2, 2));
0041 components.push_back(VertexState(position, error, (**ic).weight()));
0042 }
0043 return VertexState(new BasicMultiVertexState(components));
0044 }
0045 }
