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snaptrim - select a subset of the snapshot frames in a file
snaptrim
in=in_file out=out_file [parameter=value] ...
snaptrim reads snapshot(5NEMO)
data from in and copies a subset of the frames to out. Frames may be selected
by specifying either a time range, or sampling frequencies for particle
and diagnostic frames.
snaptrim has the option of assuming the input file
contains a sorted series (in time) of snapshots, in which case the scanning
stops immediately after the last needed snapshot is written. (see keyword
checkall= below).
The following parameters are recognized:
- in=in_file
- Input data is read from in_file, in snapshot(5NEMO)
format. Default: none.
- out=out_file
- Selected frames are written to out_file. If the name contains
a valid mstropen(3NEMO)
formatted name, the output file will be split over
multiple files. Default: none.
- times=time_range
- Select frames with time values
within time_range, which is of a form such as 1.0:1.5,2.5,3.0. A special format
is allowed to select the Nth snapshot using times=#N, where the first snapshot
is counted as 1. Special values are first, last and all. If timefuzz=nearest
(see below) is used, time_range must contain just a single value. Default:
all.
- partcyc=interval
- Select one out of every interval particle frames within
time_range; if 0, select none. Default: 1, which selects all.
- diagcyc=interval
- Select one out of every interval diagnostic frames within time_range; if
0, select none. Default: 1, which selects all.
- amnesia=t|f
- Set it to true
if you don’t want history records to be in the output file. Default: false.
- checkall=t|f
- Set it to true if you really want to be sure all snapshots
are checked if to be copied. This keyword must be set to true when the input
snapshot is not sorted in time. By setting it to false, it can speed up
scanning enormously. Default: false.
- timefuzz=
- Fuzzyness allowed in comparing
times requested for output, and actual times in snapshot. The special string
value "nearest" is also allowed to output the snapshot closest to the requested
time. In this case, the times= keyword cannot contain ranges.
snapsample(1NEMO)
,
snapmask(1NEMO)
, snapshot(5NEMO)
For times=last you should not use
a pipe in the input stream, i.e. in=-.
Joshua E. Barnes
xx-xxx-8x V1.0 Created JEB
xx-mar-89 V1.2 keyword amnesia= added JEB
12-apr-89 V1.3 keyword checkall= added PJT
5-maa-98 V1.6 added first/last times PJT
14-sep-02 V2.0 support multiple output files PJT
31-dec-03 V2.1 timefuzz= implemented PJT
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