1DBROWDIFF(1)          User Contributed Perl Documentation         DBROWDIFF(1)
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NAME

6       dbrowdiff - compute row-by-row differences of some column
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SYNOPSIS

9       dbrowdiff [-B|-I] column
10

DESCRIPTION

12       For a given column, compute the differences between each row of the
13       table.  Differences are output to two new columns, "absdiff" and
14       "pctdiff".
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16       Differences are either relative to the previous column (incremental
17       mode), or relative to the first row (baseline mode), the default.
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OPTIONS

20       -B or --baseline
21           Select baseline mode (the default), where differences are relative
22           to the first row.
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24       -I or --incremental
25           Select incremental mode, where differences are relative to the
26           previous row.
27
28       -f FORMAT or --format FORMAT
29           Specify a printf(3)-style format for output statistics.  Defaults
30           to "%.5g".
31
32       This module also supports the standard fsdb options:
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34       -d  Enable debugging output.
35
36       -i or --input InputSource
37           Read from InputSource, typically a file name, or "-" for standard
38           input, or (if in Perl) a IO::Handle, Fsdb::IO or Fsdb::BoundedQueue
39           objects.
40
41       -o or --output OutputDestination
42           Write to OutputDestination, typically a file name, or "-" for
43           standard output, or (if in Perl) a IO::Handle, Fsdb::IO or
44           Fsdb::BoundedQueue objects.
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46       --autorun or --noautorun
47           By default, programs process automatically, but Fsdb::Filter
48           objects in Perl do not run until you invoke the run() method.  The
49           "--(no)autorun" option controls that behavior within Perl.
50
51       --help
52           Show help.
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54       --man
55           Show full manual.
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SAMPLE USAGE

58   Input:
59           #fsdb      event   clock
60           _null_getpage+128       815812813.281756
61           _null_getpage+128       815812813.328709
62           _null_getpage+128       815812813.353830
63           _null_getpage+128       815812813.357169
64           _null_getpage+128       815812813.375844
65           _null_getpage+128       815812813.378358
66           #  | /home/johnh/BIN/DB/dbrow
67           #  | /home/johnh/BIN/DB/dbcol event clock
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69   Command:
70           cat DATA/kitrace.fsdb | dbrowdiff clock
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72   Output:
73           #fsdb      event   clock   absdiff pctdiff
74           _null_getpage+128       815812813.281756        0       0
75           _null_getpage+128       815812813.328709        0.046953        5.7554e-09
76           _null_getpage+128       815812813.353830        0.072074        8.8346e-09
77           _null_getpage+128       815812813.357169        0.075413        9.2439e-09
78           _null_getpage+128       815812813.375844        0.094088        1.1533e-08
79           _null_getpage+128       815812813.378358        0.096602        1.1841e-08
80           #  | /home/johnh/BIN/DB/dbrow
81           #  | /home/johnh/BIN/DB/dbcol event clock
82           #  | dbrowdiff clock
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SEE ALSO

85       Fsdb.  dbcolmovingstats.  dbrowuniq.  dbfilediff.
86
87       dbrowdiff, dbrowuniq, and dbfilediff are similar but different.
88       dbrowdiff computes row-by-row differences for a column, dbrowuniq
89       eliminates rows that have no differences, and dbfilediff compares
90       fields of two files.
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93       Copyright (C) 1991-2018 by John Heidemann <johnh@isi.edu>
94
95       This program is distributed under terms of the GNU general public
96       license, version 2.  See the file COPYING with the distribution for
97       details.
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101perl v5.32.1                      2021-01-27                      DBROWDIFF(1)
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