Transition from Associations to Links

[veprbl]

For example:

tutorial-analysis/episodes/03-analysis.md

Lines 122 to 124 in 5e1ca9c

	// Get Associations Between MCParticles and ReconstructedChargedParticles
	TTreeReaderArray<int> recoAssoc(tree_reader, "_ReconstructedChargedParticleAssociations_rec.index");
	TTreeReaderArray<int> simuAssoc(tree_reader, "_ReconstructedChargedParticleAssociations_sim.index");

cc eic/EICrecon#2822

[wdconinc]

The appropriate minimal conversion is to use:

 // Get Links Between MCParticles and ReconstructedChargedParticles 
 TTreeReaderArray<unsigned int> recoAssoc(tree_reader, "_ReconstructedChargedParticleLinks_from.index");
 TTreeReaderArray<unsigned int> simuAssoc(tree_reader, "_ReconstructedChargedParticleLinks_to.index");

Note:

• int becomes unsigned int
• *Associations_rec becomes *Links_from
• *Associations_sim becomes *Links_to
• Comments are updated to refer to links instead of associations
• The use of *Assoc as the name of the TTreeReaderArray is acceptable.

This should be applied to all instances where associations are used, not just the one highlighted in this issue.