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

NOTE: this page was directly converted from the perl FSDB manual pages from FSDB version 3.1

SYNOPSIS

dbrowdiff [-B|-I] column

DESCRIPTION

For a given column, compute the differences between each row of the table. Differences are output to two new columns, absdiff and pctdiff.

Differences are either relative to the previous column (incremental mode), or relative to the first row (baseline mode), the default.

OPTIONS

-B or –baseline

Select baseline mode (the default), where differences are relative to the first row.

-I or –incremental

Select incremental mode, where differences are relative to the previous row.

-f FORMAT or –format FORMAT

Specify a printf (3)-style format for output statistics. Defaults to %.5g.

This module also supports the standard fsdb options:

-d

Enable debugging output.

-i or –input InputSource

Read from InputSource, typically a file name, or - for standard input, or (if in Perl) a IO::Handle, Fsdb::IO or Fsdb::BoundedQueue objects.

-o or –output OutputDestination

Write to OutputDestination, typically a file name, or - for standard output, or (if in Perl) a IO::Handle, Fsdb::IO or Fsdb::BoundedQueue objects.

–autorun or –noautorun

By default, programs process automatically, but Fsdb::Filter objects in Perl do not run until you invoke the run() method. The --(no)autorun option controls that behavior within Perl.

--help

Show help.

--man

Show full manual.

SAMPLE USAGE

Input:

#fsdb event clock:d _null_getpage+128 815812813.281756 _null_getpage+128 815812813.328709 _null_getpage+128 815812813.353830 _null_getpage+128 815812813.357169 _null_getpage+128 815812813.375844 _null_getpage+128 815812813.378358 # | /home/johnh/BIN/DB/dbrow # | /home/johnh/BIN/DB/dbcol event clock

Command:

cat DATA/kitrace.fsdb | dbrowdiff clock

Output:

#fsdb event clock:d absdiff:d pctdiff:d _null_getpage+128 815812813.281756 0 0 _null_getpage+128 815812813.328709 0.046953 5.7554e-09 _null_getpage+128 815812813.353830 0.072074 8.8346e-09 _null_getpage+128 815812813.357169 0.075413 9.2439e-09 _null_getpage+128 815812813.375844 0.094088 1.1533e-08 _null_getpage+128 815812813.378358 0.096602 1.1841e-08 # | /home/johnh/BIN/DB/dbrow # | /home/johnh/BIN/DB/dbcol event clock # | dbrowdiff clock

SEE ALSO

Fsdb. dbcolmovingstats. dbrowuniq. dbfilediff.

dbrowdiff, dbrowuniq, and dbfilediff are similar but different. dbrowdiff computes row-by-row differences for a column, dbrowuniq eliminates rows that have no differences, and dbfilediff compares fields of two files.