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tipsysnap - convert tipsy file to snapshot
tipsysnap [parameter=value]
tipsysnap converts a tipsy ascii or binary formatted data file,
consisting of gas, dark and star- particles to snapshot(5NEMO)
format. Simple
selections by particle kind can be made.
The following parameters
are recognized in any order if the keyword is also given:
- in=
- Input TIPSY
file. No default.
- out=
- Output snapshot file. No default.
- options=
- Output which
particles?. Valid options are gas, dark and star. Default: gas,dark,star
(all).
- modes=ascii|binary
- Read ascii or binary TIPSY file format. Default:
ascii
- swap=t|f
- Swap bytes. This is needed if you want to be able to read
standard (XDR, big endian) or native binary files. Default: false.
- offset=0
- Number of bytes to offset the data portion from the header. Normally this
would be 0, but the header strcture (tipsydefs.h) containing one double
and 5 integers, some architectures may read this as 32 bytes, whereas it
was meant to be 28 bytes. By using offset=-4 in this case, data with 28 byte
headers can still be read. Equally so, the opposite can also happen, in
which case offset=4 is needed. Default: 0
See also tipsy(5NEMO)
on some basic concepts of tipsy data. The ascii format of a TIPSY "gds"
(gas-dark-star) snapshot is essentially a single long column of data with
the following items
ntot ngas nstar [noting that ndark=ntot-ngas-nstar]
ndim [usually 3, i’ve not see ndim=2 data]
time [a floating point number]
M(g),M(d),M(s) [but all of these in 1 column]
X(g),X(d),X(s)
Y(g),Y(d),Y(s)
Z(g),Z(d),Z(s)
VX(g),VX(d),VX(s)
VY(g),VY(d),VY(s)
VZ(g),VZ(d),VZ(s)
EPS(d), EPS(s)
...
In mode=binary the gas, dark and star particles are output in separate
snapshots.
snaptipsy(1NEMO)
, stoa_tip(1ZENO)
, tipsy(5NEMO)
Peter
Teuben
02-Sep-94 V1.0 Created PJT
19-aug-00 V2.0 add mode= to allow binary files, added swap= PJT
28-aug-01 V2.1 process binary data, added offset= (replaces shortlives fix32=t|f) PJT
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