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.TH extract
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.TH extract
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.SH extract
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.SH extract
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.B extract - extract columns, times, single trajectories and starting positions
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.B extract - extract columns, times, single trajectories and starting positions
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.SH SYNOPSIS
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.SH SYNOPSIS
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.B extract
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.B extract
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.I inptra
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.I inptra
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.I outtra
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.I outtra
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.I mode
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.I mode
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.SH DESCRIPTION
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.SH DESCRIPTION
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Extract columns, times, single trajectories or starting positions from an input trajectory file
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Extract columns, times, single trajectories or starting positions from an input trajectory file
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.I inptra
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.I inptra
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and write output to a new trajectory file
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and write output to a new trajectory file
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.I outtra.
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.I outtra.
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The different extraction modes are specified with
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The different extraction modes are specified with
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.I mode.
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.I mode.
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Note: the time, longitude, latitude and pressure need not be extracted beacuse they are an integral part of every trajectory file - they are extracted by default.
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Note: the time, longitude, latitude and pressure need not be extracted beacuse they are an integral part of every trajectory file - they are extracted by default.
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.SH EXTRACTION MODE
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.SH EXTRACTION MODE
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.TP 5
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.TP 5
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.B -var
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.B -var
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extract columns of a trajectory file; the columns can be listed by name (e.g. -var TH PV RH) or a range of columns can be specified by the "to" operator (e.g. -var TH to PV). The two modes can also be combined: "-var TH to PV RH" extracts all columns between TH and PV, and additionally RH.
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extract columns of a trajectory file; the columns can be listed by name (e.g. -var TH PV RH) or a range of columns can be specified by the "to" operator (e.g. -var TH to PV). The two modes can also be combined: "-var TH to PV RH" extracts all columns between TH and PV, and additionally RH.
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.TP 5
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.TP 5
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.B -time
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.B -time
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extract trajectory times; the times cna be given as a list of times (e.g. -time 6 12) or as a time range (e.g. -time 6 to 18).
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extract trajectory times; the times cna be given as a list of times (e.g. -time 6 12) or as a time range (e.g. -time 6 to 18).
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.TP 5
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.TP 5
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.B -tra
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.B -tra
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extract single trajectories; the index of the trajectories can be specified as a list (e.g. -tra 10 12 14) or as a range of trajectories (e.g. -tra 10 to 20).
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extract single trajectories; the index of the trajectories can be specified as a list (e.g. -tra 10 12 14) or as a range of trajectories (e.g. -tra 10 to 20).
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.TP 5
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.TP 5
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.B -startf
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.B -startf
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extract list (longitude, latitude, pressure) of starting positions ofvthe trajectory file (corresponding to time 0).
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extract list (longitude, latitude, pressure) of starting positions ofvthe trajectory file (corresponding to time 0).
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.TP 5
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.TP 5
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.B -index
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.B -index
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extract single trajectories - the trajectory indices (from 1 to #trajectories) are given on a file (e.g. -index filename).
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extract single trajectories - the trajectory indices (from 1 to #trajectories) are given on a file (e.g. -index filename).
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.TP 5
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.TP 5
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.B -boolean
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.B -boolean
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extract single trajectories - the trajectory are specified on a boolean (0/1) file (e.g. -boolean filename).
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extract single trajectories - the trajectory are specified on a boolean (0/1) file (e.g. -boolean filename).
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.SH EXAMPLES
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.SH EXAMPLES
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.TP 5
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.TP 5
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.B [1] extract inptra outtra -time 6 to 36 72
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.B [1] extract inptra outtra -time 6 to 36 72
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read input trajectory file "inptra", extract times 6 to 36 and additionally time 72, and write output to trajectory file "outtra".
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read input trajectory file "inptra", extract times 6 to 36 and additionally time 72, and write output to trajectory file "outtra".
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.TP 5
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.TP 5
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.B [2] extract inptra outtra -index indfile
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.B [2] extract inptra outtra -index indfile
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reads input trajectories from "inptra" and write all trajectories to "outtra" which are listed in the file "indfile". In "infile" the indices of selected trajectories are listed line-by-line.
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reads input trajectories from "inptra" and write all trajectories to "outtra" which are listed in the file "indfile". In "infile" the indices of selected trajectories are listed line-by-line.
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.SH AUTHOR
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.SH AUTHOR
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Written by Michael Sprenger and Heini Wernli (January 2011)
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Written by Michael Sprenger and Heini Wernli (January 2011)
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