Author:         Martin Asser Hansen - Copyright (C) - All rights reserved

Contact:        mail@maasha.dk

Date:           August 2007

License:        GNU General Public License version 2 (http://www.gnu.org/copyleft/gpl.html)

Description:    Calculate the mean of values of given keys.

Usage:          ... | $script [options]

Options:   [-x          | --no_stream]          -  Do not emit records.
Options:   [-o <file>   | --data_out=<file>]    -  Write result to file.
Options:   [-k <string> | --keys=<string>]      -  Comma separated list of keys.
Options:   [-I <file>   | --stream_in=<file>]   -  Read input from stream file  -  Default=STDIN
Options:   [-O <file>   | --stream_out=<file>]  -  Write output to stream file  -  Default=STDOUT

Examples:   ... | $script -x -k SEQ_LEN,HIT_LEN -o result.txt  -  Calculate mean values and save to 'result.txt'.

Keys out: <key>_MEAN  -  Mean value of <key>.