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:

-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      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) 1991-2018 by John Heidemann <johnh@isi.edu>

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