Fsdb::Filter::dbrowaccumulate

NAME

dbrowaccumulate - compute a running sum of a column

SYNOPSIS

dbrowaccumulate [-C increment_constant] [-I initial_value] [-c increment_column] [-N new_column_name]

DESCRIPTION

Compute a running sum over a column of data, or of a constant incremented per row, perhaps to generate a cumulative distribution.

What to accumulate is specified by "-c" or "-C".

The new column is named by the "-N" argument, defaulting to "accum".

OPTIONS

-c or --column COLUMN

Accumulate values from the given COLUMN. No default.

-C or --constant K

Accumulate the given constant K for each row of input. No default.

-I or --initial-value I

Start accumulation at value I. Defaults to zero.

-N or --new-name N

Name the new column N. Defaults to "accum".

This module also supports the standard fsdb options:

-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 diff
0.0
00.000938
00.001611
00.001736
00.002006
00.002049
# | /home/johnh/BIN/DB/dbrow
# | /home/johnh/BIN/DB/dbcol diff
# | dbsort diff

Command:
cat DATA/kitrace.fsdb | dbrowaccumulate -c diff

Output:
#fsdb diff accum
0.0 0
00.000938 .000938
00.001611 .002549
00.001736 .004285
00.002006 .006291
00.002049 .00834
# | /home/johnh/BIN/DB/dbrow
# | /home/johnh/BIN/DB/dbcol diff
# | dbsort diff
# | /home/johnh/BIN/DB/dbrowaccumulate diff

SEE ALSO

Fsdb, dbrowenumerate.

CLASS FUNCTIONS

new
$filter = new Fsdb::Filter::dbrowaccumulate(@arguments);

Create a new dbrowaccumulate object, taking command-line arguments.

set_defaults
$filter->set_defaults();

Internal: set up defaults.

parse_options
$filter->parse_options(@ARGV);

Internal: parse command-line arguments.

setup
$filter->setup();

Internal: setup, parse headers.

run
$filter->run();

Internal: run over each rows.

AUTHOR and COPYRIGHT

Copyright (C) 1991-2022 by John Heidemann <johnh AT isi DOT edu>

This program is distributed under terms of the GNU general public license, version 2. See the file COPYING with the distribution for details.