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snapsort - sort particles of an N-body snapshot
snapsort in=in_file
out=out_file [parameter=value] ...
snapsort sorts the bodies of
a snapshot by a user-specified ranking. Optionally, a different sort engine
can be invoked.
The following parameters are recognized.
- in=in_file
- Input data is read from in_file, which must be in snapshot(5NEMO)
format.
Default: required.
- out=out_file
- Sorted output data is written to out_file.
No default.
- rank=body_rank
- Expression used to compute the rank of each body.
See bodytrans(1NEMO)
for the form of body_rank. Default: etot.
- times=time_range
- Only frames within time_range will be sorted. Default: all.
- sort=sort_engine
- Select the sort engine to use. Sorry, no minimum match here. If the code
has been compiled with standard the flogger software (see $NEMO/usr/lib/sort),
a number of sort engines are available (see below). Else, only the standard
qsort(3)
is available. Default: [qsort].
The default UNIX engine
qsort (a quick sort) is always available. If your friendly NEMO manager
has compiled in a number of additional ones, the following list may be
a complete one: (to get your current local list, run snapsort with debug=1,
which will display the names it’s trying. Use some foolish name for sort=
to get it to display all of them, and then fail.
sort= comments
qsort Standard UNIX sqort(3)
bubble any 1st semester course in CS
heap contributed by der Mouse
insert insertion sort, any 1st semester course in CS
merge roughly patterned after Knuth Vol. 3
quick C.A.R. Hoare’s recursive sort as given in K&R 2 pg 87
shell D.L. Shell as given in K&R 2 pg 62
snapshot(5NEMO)
, qsort(3)
msort(1)
Joshua E. Barnes.
~src/nbody/trans/snapsort.c program
code ~usr/lib/sort/*_sort.c additional sort routines;
2-jun-88 V1.0 original version JEB
21-dec-92 V1.4 selectable sort engine (sort=) PJT
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