NHSE Software Catalog

AFOF

url

ftp://ftp-hpcc.astro.washington.edu/pub/hpcc/afof.0.9.tar.gz

title_line

an approximate friends-of-friends group finder for
cosmological N-body simulations

contact

hpccsoft@astro.washington.edu

version

0.9

abstract

Afof is an approximate group finder, which uses the
friends-of-friends method to find groups. A particle belongs to a
friends-of-friends group if it is within some linking length tau of
some other particle in the group. The algorithm is approximate. It
takes an additional parameter epsilon which indicates how much
error can be tolerated. The error will take the form of over-linking.
After all such groups are
found, those with less than a specified minimum number of group
members are rejected. The program takes input files in the tipsy
binary format and produces a single ASCII output file called afof.grp.
The afof.grp file
can be read in by tipsy and used to visualize the groups that
are found by afof. Simulations with periodic boundary conditions can
also be handled by afof by specifying the period in each dimension on
the command line.

keywords

data analysis; cosmology; N-body problems

description

http://www-hpcc.astro.washington.edu/tools/