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snapgadget [parameter=value]

Description

snapgadget converts data from standard snapshot(5NEMO) format into gadget(lNEMO) .

Although gadget(lNEMO) has several flavors of particles (halo, disk, bulge, stars, gas), this version can only handle a limited set due to current limitations in the way snapshot’s are handled.

Some programs (e.g. AHF) that need proper cosmological information in a gadget header, will need these explicitly passed via a set of parameters (see below).

Parameters

The following parameters are recognized in any order if the keyword is also given:
in=
Input file (snapshot format). No default.
out=
Output file (gadget format). Each snapshot is placed in its own file, and "%t" is replaced with the time of the snapshot (useful for times=all). No default.
N=Nhalo,Ndisk,Nbulge,Nstars
Nhalo,Ndisk,Nbulge,Nstars needs to be specified for the sub-components as GADGET wants them. Note the current version does not handle gas particles. No default.
M=Mhalo,Mdisk,Mbulge,Mstars
The masses (per particle) of each of the components listed in the N= keyword. You only need this if no masses are present. Note in this mode it is not possible to have different masses per component. Default: not used.
times=
Times of the snapshots to select for output. Default: all
swap=
Force swaping bytes for other-endian machines [f] z= Current Redshift [0]
box=
Box size (Mpc/h) [128]
omega0=
Omega_0 [1]
lambda=
OmegaLambda [1]
h=
HubbleParam [0.75]

Caveat

There is an option to run gadget in double precision mode, their output files may not be compatible with this version of the program.

See Also

gadgetsnap(1NEMO) , nemo2gadget(1NEMO) , gadget2nemo(1NEMO) , uns2uns(1NEMO) , snapshot(5NEMO)

http://www.mpa-garching.mpg.de/gadget/

Files

Author

Jeremy Bailin

Update History


8-sep-03    V0.1 Created    J.Bailin
8-sep-03    V0.2 minor mods on order of arguments, fix missing %t case    PJT
21-jun-11    V1.0 add some reasonable cosmo defaults, in case they’re needed    PJT
22-jun-11    V1.1 add M=


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