Page History

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1. Cameron – ldmx-sim
   1. Some discussion on std-hep as an input format. Omar agrees that this is reasonable "It benefits ldmx-sim to have many input formats". With std-hep file reading capability, compatibility with existing files (and tools) will be OK. Many tools can be put in ldmx-sim though.
2. Cameron - hpstr update
   1. See slides.
3. Robert Johnson - Kalman Filter
   1. Robert found an issue with coordinate transformations. Now the results are the same as the hps-java.
   2. He will fill an interface to GBL. This is useful for Millipede, and also the GBL code more easily provides the full co-variant matrix.
4. Tongtong  - stdhep tools
   1. He found a memory leak in the stdhep tools. This was causing issues running on large files.
   2. Issue with fie open not returning the number of events properly.
   3. Use of random_sample.cc - 
      1. Need to produce more events than N for random sampling. 
      2. random_sample.cc reads in all the input into a vector. This takes a lot of memory.
      3. random_sample.cc picks the input events at random. This means that an estimate of 37% input events are not used, and 37% are used more than once.
         1. Solution1: random_sample_usingInputEventsInOrder.cc  – Just takes the events in order, avoiding the memory issue and the usage issue.
         2. Solution2: Update of random_sample.cc  – Use the std::shuffle to randomize the order of the events. No waste of electrons, and less memory use.
5.  Tontong - Trigger Diagnostics 2019 
   1. Confluence page detailing development: "Trigger Diagnostics 2019 "
   2. Replaces a number of the drivers that were used for the 2015/2016 data sets, instead of modifying the existing files, creates new "2019" versions. Kyle suggests to use inheritance to make this a clearer more maintainable update.