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snapinert - calculate momentum of inertia of a snapshot
snapinert
in=snapshot out=out-file [parameter=value]
snapinert calculates
the momentum of inertia of a snapshot. The output is ASCII and consists
of three parts:
1) Time
2) Moment of inertia tensor
3) Eigenvalues and
Eigenvectors of (2)
.
The program snapkinem(1NEMO)
does similar things -
ideas should be combined.
The following parameters are recognized
in any order if the keyword is also given:
- in=in-file
- input file, must be
in SnapShot(5)
format [no default].
- out=out-file
- output file, ASCII format
[no default]
- times=time-range
- Only data frames with time values within
time-range, which is of the form, eg, "1.0:1.5,2.5,3.0", will be translated.
[default: all].
- weight=expression
- The value of expression is used to compute
the center of the coordinate and also the momentum of inertia. expression
is a real-valued C language expression over the real values x, y, z,
vx, vy, vz, phi, m, t, and the integer value i. [default : 1]
- per_weight=t|f
- Logical if the result is weight-normalized. [default: t].
- tab=t|f
- Usually
snapinert gives the result in a (barely) human-readable format. This option
forces all values printed in one line, so that other programs such as MONGO,
TABMATH(NEMO1) and AWK can easily access it. [default: f].
snapkinem(1NEMO)
,
snaprect(1NEMO)
, bodytrans(3NEMO)
From some reasons the source library
of the "Numerical Recipes in C" is required to compile snapinert. Since
the standard NEMO package does not include the Numerical Recipes, on sites
that does not have the sources of Numerical Recipes snapinert cannot be
compiled. The Makefile assumes the source library to exist in $NUMRECPATH.
Jun Makino
30-Jun-88 V1.0: Created JM
7-jul-89 V1.2: get_snap(), oneline= keyword is now tab= PJT
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