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hackforce, hackforce_qp - hierarchical force calculation
hackforce
in=in-file [parameter=value] ...
hackforce calculates the forces
on particles due to a particle distribution (not necessarely the same)
using an an adaptave Eulerian tree to reduce the number of interactions
to O(NlogN).
hackforce_qp is similar, but includes quadrupole corrections
to body-cell interactions (L. Hernquist, App. J. Suppl., 1987).
The
following parameters are recognized; they may be given in any order if
the keyword is also given.
- in=in-file
- Input snapshot file, which contain
the particles for which the forces need to be calculated [no default].
- out=out-file
- Output file to which, if given, the results are written to. Wil be in snapshot
format.
- test=test-file
- Test file, which contains the set of particle from
which the forces are calculated. If not given, the particle distribution
is taken from the in-file [default: not used].
- tol=theta-value
- Opening-angle
tolerence parameter. Default is 1.0.
- eps=soft-length
- Force softening parameter.
Default is 0.05.
- rsize=length
- Initial guess of size of box which should contain
all the particles. This may be of the [default: 4].
- rmin=
- Lower left corner
of the initial corner. May be of the form "num,num,num" [default: -rmin/2,
i.e. a centered box].
- options=option-string
- Miscellaneous control options,
specified as a comma-separated list of keywords. Currently recognized keywords
are: mass, phase: outputs as extra the mass and phase coordinates. Potential
and acceleration data are always output. [default: mass,phase].
- fcells=fcells-value
- Ratio of cells to bodies, used when allocating cells. Default is 0.75.
hackcode1(NEMO)
Joshua E. Barnes.
~/src/josh/hackcode/source1/*
xx-xxx-87 V0: created JEB
7-jul-89 V1.1 doc written, keyorder and some defaults changed PJT
29-mar-04 V1.6 major code cleanup for MacOS 10.3 and prototypes PJT
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