Number of elements, average value, min & max from a list of numbers using awk Post: 302729127

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Top Forums Shell Programming and Scripting Number of elements, average value, min & max from a list of numbers using awk Post 302729127 by RudiC on Friday 9th of November 2012 05:19:48 AM

11-09-2012

Registered User

May I propose a few enhancements/corrections to elixir_sinari's post:
a) c will be identical to NR even if empty lines are encountered, so it can be replaced by NR and left out OR we need to check for empty lines, e.g. NF>0.
b) min and max will be empty and either of them will stay empty as long as 0 is not traversed. They should be initialized.
c) min and/or max will be distorted by empty lines, so a check for that will be mandatory.
Pls try:

Code:

awk 'NR==1  {min=max=$1}
     NF > 0 {total+=$1; c++;
             if ($1<min) {min=$1}
             if ($1>max) {max=$1}
            }
     END {OFMT="%.6f"
          print "Total numbers   : " c
          print "Smallest number : " min
          print "Largest number  : " max
          print "Average         : " total/c}
    ' file

Last edited by RudiC; 11-10-2012 at 08:54 AM.. Reason: small corrections to text and code (replaced <= by <, >= by > for min/max)

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LEARN ABOUT DEBIAN

latency

LATENCY(1)							      Xenomai								LATENCY(1)

NAME

       latency - Xenomai timer latency benchmark

SYNOPSIS

       latency [options]

DESCRIPTION

       latency	is part of the Xenomai test suite. It is a timer latency benchmark program.  The system must run a suitable Xenomai enabled kernel
       with the respective module (xeno_timerbench).

OPTIONS

       latency accepts the following options:

       -h     print histograms of min, avg, max latencies

       -s     print statistics of min, avg, max latencies

       -H <histogram-size>
	      default = 200, increase if your last bucket is full

       -B <bucket-size>
	      default = 1000ns, decrease for more resolution

       -p <period_us>
	      sampling period

       -l <data-lines per header>
	      default=21, 0 to supress headers

       -T <test_duration_seconds>
	      default=0, so ^C to end

       -q     supresses RTD, RTH lines if -T is used

       -D <testing_device_no>
	      number of testing device, default=0

       -t <test_mode>
	      0=user task (default), 1=kernel task, 2=timer IRQ

       -f     freeze trace for each new max latency

       -c <cpu>
	      pin measuring task down to given CPU

       -P <priority>
	      task priority (test mode 0 and 1 only)

AUTHOR

       latency was written by Philippe Gerum <rpm@xenomai.org>. This man page was written by Roland Stigge <stigge@antcom.de>.

2.6.0								    2008-04-19								LATENCY(1)

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