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Name

uns_density - estimate mass density based on distance to Kth neighbour, add distance to the kth neighbours

Synopsis

uns_density in=in_file out=out_file [parameter=value] ...

Description

uns_density reads a compatible UNS snapshot, estimate mass density based on distance to Kth neighbour, add distance to the kth neighbours, and save it in a NEMO format file. It computes very quickly density by using falcON library from Walter Dehnen (WD). It works like density program (WD) but accepts UNS input snapshot, plus 2 differents method to estimate density, making it more versatile.

Parameters

The following parameters are recognized.
in=uns input file snapshot
give as input a compatible UNS file snapshot (Nemo, Gadget, Ramses...) Default: required.
out=out_file
Output NEMO file name. You can give a filename or "-" (to pipe with another NEMO program). Default: required.
select=select-particles
Select particles. Set of particles must be selected using the ":" range operator, separated by a comma. E.g. select=0:9,10:19 would select two sets of 10 particles, or by component (gas,halo,stars,bulge,disk,bndry) for Gadget/Ramses files. E.g. select=gas,stars . Default: required.
m=method
select method to approximate density, 0:used by density program (WD), 1:used by hackdens program [0]
K=number of neighbours
select number of neighbours to approximate density [32]
N=order
order of Ferrers kernel [1]
ncrit=alue
ncrit value, if empty=max(1,K/4) []
times=time-range
Select time [all]
first=boolean
if true, add a trailing number to the first output file [f]
offset=time offset
+/- time offset between two consecutives snapshots [0.01]
verbose=flag
If true, give some verbose output [t].

See Also

falcON(1falcON) , hackdens(1NEMO) , uns_projects(1NEMO) , snapshot(5NEMO)
https://projets.lam.fr/projects/unsio/wiki

Author

Jean-Charles LAMBERT

History


17-Mar-20    V2.0 manual created    JCL


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