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snappeak - find peak in each phase space coordinate using a mode analysis
snappeak in=in_file [parameter=value] ...
snappeak finds
the peak in the distribution of points in phase space. When the coordinate
system is cartesian, the peaks in position actually correspond to the density
center.
This method is an application of the general problem of the statistical
analysis of a (probablity) distribution function. One can determine the
median, position where there is equal chance (half) of being to the left
or right, the mean being the averaged position of a distribution function
and the mode where the distribution function takes its maximum value (probability).
This program computes the maximum peak value of the distribution function
in each coordinate independantly.
The following parameters are
recognized:
- in=in_file
- input file, in snapshot(5NEMO)
format. Default:
none.
- window=number
- The number of particles used in the sliding window of
the mode analysis. It is a kind of smoothing parameter. [default: 100].
- times=time-ranges
- Only snapshots with time values within times-ranges, which is of the form
ts[:te],..., will be copied. [default: all].
This program has not been
loaded in the official release of NEMO. If you need it, ask the author
for a copy or to add it to NEMO. Better alternatives are snapcenter(1NEMO)
,
and snapdens(1NEMO)
Peter Teuben
xx-nov-86 V1.0: original version Peter Teuben
15-jan-87 V1.0a: improvements PJT
10-jun-87 V1.0b: some cleanup PJT
6-jun-88 V1.1: new filestruct PJT
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