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#!/usr/bin/perl -w

#
# dbrowaccumulate.pm
# Copyright (C) 1991-2022 by John Heidemann <johnh@isi.edu>
#
# This program is distributed under terms of the GNU general
# public license, version 2.  See the file COPYING
# in $dblibdir for details.
#

=head1 NAME

dbrowaccumulate - compute a running sum of a column

=head1 SYNOPSIS

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

=head1 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<-c> or C<-C>.

The new column is named by the C<-N> argument, defaulting to C<accum>.

=head1 OPTIONS

=over 4

=item B<-c> or B<--column> COLUMN

Accumulate values from the given COLUMN.
No default.

=item B<-C> or B<--constant> K

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

=item B<-I> or B<--initial-value> I

Start accumulation at value I.
Defaults to zero.

=item B<-N> or B<--new-name> N

Name the new column N.
Defaults to C<accum>.

=back

=for comment
begin_standard_fsdb_options

This module also supports the standard fsdb options:

=over 4

=item B<-d>

Enable debugging output.

=item B<-i> or B<--input> InputSource

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

=item B<-o> or B<--output> OutputDestination

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

=item B<--autorun> or B<--noautorun>

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

=item B<--help>

Show help.

=item B<--man>

Show full manual.

=back

=for comment
end_standard_fsdb_options

=head1 SAMPLE USAGE

=head2 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

=head2 Command:

cat DATA/kitrace.fsdb | dbrowaccumulate -c diff

=head2 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

=head1 SEE ALSO

L<Fsdb>,
L<dbrowenumerate>.

=cut

# WARNING: This code is derived from dbrowaccumulate.pm; that is the master copy.

use Fsdb::Filter::dbrowaccumulate;
my $f = new Fsdb::Filter::dbrowaccumulate(@ARGV);
$f->setup_run_finish;  # or could just --autorun
exit 0;

=head1 AUTHOR and COPYRIGHT

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

=cut

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