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snapstack - superimpose two N-body snapshots
snapstack in1=in_file1
in2=in_file2 out=out_file [parameter=value] ...
snapstack reads
in two N-body systems and outputs one containing particles from both. It
may be used to set up collisions by specifying offsets in position and
velocity space.
If more than two snapshots need to be stacked, multiple
runs of snapstack. would be needed, or snapadd(1NEMO)
can be used.
The
following parameters are recognized.
- in1=in_file1
- in2=in_file2
- Input data
will be read from these files, which must be in snapshot(5NEMO)
format.
Only the first frames are used. Default: required.
- out=out_file
- Output data
will be written to out_file.
- deltar=rel_position
- Relative position of first
snapshot w.r.t. second. Default: 0.0,0.0,0.0.
- deltav=rel_velocity
- Relative velocity
of first snapshot w.r.t. second. Default: 0.0,0.0,0.0.
- zerocm=zero_cm_flag
- If true,
translate to center of mass before output. Default: false.
- shift=1|2
- Shift
system1 or system2? If the final system is shifted with center of mass
moved to the center, this option is not relevant anymore. Default: 1.
- headline=message
- Text message prepended to out_file. Default: none.
snapadd(1NEMO)
,
snapshot(5NEMO)
Joshua E. Barnes
2-jun-88
22-jan-89 V1.1 ??? JEB
20-jun-03 V1.2 using new get_snap/put_snap PJT
5-aug-06 V2.0 added shift= and made zerocm=f default PJT
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