snap.write.1: Write out a Gadget format 1 snapshot file

In asgr/snapshot: Gadget N-body cosmological simulation code snapshot format 1 and 2 I/O utilities

Description

This function allows the user to write format 1 Gadget snapshots. It can write the particle information and header information, which are provided as separate R objects.

Usage

snap.write.1(part, head, file)

Arguments

part	A data.frame containing the main particle level information. Columns required are: ID particle ID x x position in units of Mpc y y position in units of Mpc z z position in units of Mpc vx x velocity in units of km/s vy y velocity in units of km/s vz z velocity in units of km/s Mass particle mass in units of Msun
head	A list containing various header information as list elements. These are: Npart Vector of length 6 containing the number of particles in this snapshot file, where: gas [1] / collisionless particles [2:6] Massarr Vector of length 6 containing the particle masses for the respective particle types in Npart Time Time of snapshot in units of km/s and kpc so 1 unit is ~10 Gyrs z Redshift of snapshot FlagSfr Star formation turned on/off Nall Vector of length 6 containing the number of particles in all snapshot files, where: gas [1] / collisionless particles [2:6] FlagFeedback Feedback turned on/off FlagCooling Cooling turned on/off NumFiles Number of files per snapshot- usually 1 BoxSize Size of simulation box edge length in units of kpc OmegaM Omega matter of the simulation OmegaL Omega lambda of the simulation h Hubble constant divided by 100 used in the simulation FlagAge Stellar ages on/off FlagMetals Stellar metallacities on/off NallHW Tell Gadget to use large integers for the respective particle types in Npart - not usually necessary flag_entr_ics Entropy for gas on/off
file	The full path to the Gadget snapshot to be created.

Value

No value returned, called for the side-effect of writing out a binary Gadget file.

Author(s)

Aaron Robotham

See Also

snap.read.1, snap.add.head.1, snap.gen.param

Examples

## Not run: 
temp=snap.write.1(snap$part,snap$head,'somepath/snapshot_XXX')

## End(Not run)

asgr/snapshot documentation built on Oct. 8, 2020, 2:52 p.m.