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

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# 1  
Old 11-09-2012
Number of elements, average value, min & max from a list of numbers using awk
Hi all,

I have a list of numbers. I need an awk command to find out the numbers of elements (number of numbers, sort to speak), the average value the min and max value. Reading the list only once, with awk.

Any ideas?

Thanks!
# 2  
Old 11-09-2012
Since you haven't provided any samples, I'll just throw in a solution with assumptions:
Code:
awk '{total+=$1;c++}
$1<=min{min=$1}
$1>=max{max=$1}
END{
OFMT="%.6f"
print "Total numbers   : " c
print "Smallest number : " min
print "Largest number  : " max
print "Average         : " total/NR}' file

Last edited by elixir_sinari; 11-09-2012 at 05:21 AM..
# 3  
Old 11-09-2012
Quote:
Originally Posted by elixir_sinari
Since you haven't provided any samples, I'll just throw in a solution with assumptions:
Code:
awk '{total+=$1}
$1<=min{min=$1}
$1>=max{max=$1}
END{
OFMT="%.6f"
print "Total numbers   : " total
print "Smallest number : " min
print "Largest number  : " max
print "Average         : " total/NR' file

Thank you. It only lacks 2 things :
- I guess there's a missing "}" in your statement, I've added at the end of the command, it works.
- I also need the number of numbers (number of elements in the list), not the "total". The total I know it is necessary for the average value, but I don't needed it printed, I need the number of elements in the list instead.

Please Smilie
# 4  
Old 11-09-2012
Quote:
Originally Posted by black_fender
Thank you. It only lacks 2 things :
- I guess there's a missing "}" in your statement, I've added at the end of the command, it works.
- I also need the number of numbers (number of elements in the list), not the "total". The total I know it is necessary for the average value, but I don't needed it printed, I need the number of elements in the list instead.

Please Smilie
Oops, I must've been sleeping when I wrote that!!!
Corrected and the required changes done in my earlier post.
This User Gave Thanks to elixir_sinari For This Post:
black_fender
# 5  
Old 11-09-2012
Quote:
Originally Posted by elixir_sinari
Oops, I must've been sleeping when I wrote that!!!
Corrected and the required changes done in my earlier post.
Thanks a lot!
You've saved my lazy ass again :P
# 6  
Old 11-09-2012
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)
This User Gave Thanks to RudiC For This Post:
elixir_sinari
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