Parallel FOF Groupfinder
The most current version of the parallel FoF Groupfinder:
Testing
This code produces consistent groups in comparison with the University of Washington FOF code, which included a test on one of the Carmen outputs.
The groups do not appear to be consistent with a different groupfinder (FoF-Special) that Michael shared with me (Cameron).
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Binding energies should be better tested.
ASCII group statistics
An ASCII group file can be created by the utility calc_group_stats.
Quick directions:
Run ntropy-fofsv with the --OutFormat PV (position and velocity) option
in fofsv/util compile the utility with make calc_group_stats
run utility on the BGC output: calc_group_stats *.bgc > ascii.halos
PR6 includes three significant changes to calc_group_stats:
- it fixes a bug that produced incorrect COM positions and velocities.
- it now properly handles periodic boundary issues, flagging them in the output.
- information comments in the output, e.g. "# stuff" are now suppressed due to popular demand.