NHSE Software Catalog

FOF

url

ftp://ftp-hpcc.astro.washington.edu/pub/hpcc/fof-1.1.tar.gz

title_line

a friends-of-friends group finder for cosmological N-body
simulations

contact

hpccsoft@astro.washington.edu

version

1.1

abstract

Fof is a simple 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 of any other particle in the
group. 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 fof.grp. This output file is in the tipsy
array format and contains the group number to which each particle
belongs.
The fof.grp file can be read in by tipsy and used to
visualize the groups that are found by fof. Simulations with periodic
boundary conditions can also be handled by fof by specifying the
period in each dimension on the command line.
For a more sophisticated group finding code, see the denmax
program.

keywords

data analysis; cosmology; N-body problems

description

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