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Name

snapkinem - compute kinematic diagnostics for snapshot

Synopsis

snapkinem in=snap_file [parameter=value] ...

Description

snapkinem computes various kinematic diagnostics from the input N-body snapshot. These include the center of mass position and velocity, angular momentum about the center of mass, moment of inertia tensor, and kinetic energy tensor. An arbitrary weighting may be specified for each particle.

Parameters

The following parameters are recognized.
in=snap_file
Input data is read from snap_file, which must be in snapshot(5NEMO) format. Default: required.
times=time_range
Only frames within time_range will be analyzed. Default: all.
weight=body_weight
Expression used to compute the weight of each body. See bodytrans(1NEMO) for the form of body_weight. Default: 1.0.
rcut=cutoff_radius
If cutoff_radius is greater than zero, only particles within cutoff_radius of the body_weighted centroid will be used to compute the final diagnostics. Default: 0.0.

See Also

snapinert(1NEMO) , snaprect(1NEMO) , snapplot(1NEMO) , snapshot(5NEMO)

Author

Joshua E. Barnes.

History


5-mar-89    V1.2     JEB
2-may-92    V1.3: helpvec/usage for new NEMO    PJT
11-jun-92    V2.0: angular momentum as r.v, not v.r    PJT


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