dbrowaccumulate man page

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.

Info

2017-06-05 perl v5.26.0 User Contributed Perl Documentation