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Full Discussion: Calculating average from files
Top Forums Shell Programming and Scripting Calculating average from files Post 302960814 by Don Cragun on Thursday 19th of November 2015 05:28:01 PM
Old 11-19-2015
Quote:
Originally Posted by avina
I have some files with the following contents.I would like to calculate average of fifth column. How can I do this with awk?

Code:
file1

cat 95.9    152 78.0    17.9
rat 67.1    153 36.5    30.6
dog 81.4    154 68.1    13.3
dog 92.0    155 55.5    36.5
rat 73.8    156 23.9    49.9
file2

rat    79.0     157  64.3   14.7
fish   67.7     158  4.9    62.8
goat   90.2     159 80.7    9.5
dog    130.8    160 25.1    105.7

desired output

cat    17.9
rat    31.73
dog    51.83
fish   62.8
goat   9.5

I used the following code to calculate average. But the output is wrong.
Code:
awk '{a[$1]+=$5}END {for (i in a) {print i,a[i];Total+=a[i]}; print "average - ", Total/NR}' *

Code:
rat 95.2
goat 9.5
fish 62.8
cat 17.9
dog 155.5
average -  37.8778

Saying "the output is wrong" doesn't help us much. What, in the output you are getting, is wrong? With your sample input, what output are you trying to get? The output you said you want does not show the sum of values for each animal nor the average value for each animal (except for animals that only appear in one of your input files). Are you trying to prints animal sums in the output, or animal averages?

What values are you trying to average in your final line of output? Are you trying to calculate the average of all of the input values (which seems to be what your code is doing)? Are you trying to calculate the average of the averages for each animal? Are you trying to calculate the average of the sums for each animal?
 

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LEARN ABOUT CENTOS

paps

PAPS(1) 						      General Commands Manual							   PAPS(1)

NAME

       paps - UTF-8 to PostScript converter using Pango

SYNOPSIS

       paps [options] files...

DESCRIPTION

       paps reads a UTF-8 encoded file and generates a PostScript language rendering of the file. The rendering is done by creating outline curves
       through the pango ft2 backend.

OPTIONS

       These programs follow the usual GNU command line syntax, with long options starting with  two  dashes  (`-').   A  summary  of  options	is
       included below.

       --landscape
	      Landscape output. Default is portrait.

       --columns=cl
	      Number of columns output. Default is 1.

       --font=desc
	      Set the font description. Default is Monospace 12.

       --rtl  Do rtl layout.

       --paper ps
	      Choose paper size. Known paper sizes are legal, letter, a4. Default is A4.

       --bottom-margin=bm
	      Set bottom margin in postscript points (1/72 inch). Default is 36.

       --top-margin=tm
	      Set top margin. Default is 36.

       --left-margin=lm
	      Set left margin. Default is 36.

       --right-margin=rm
	      Set right margin. Default is 36.

       --help Show summary of options.

       --header
	      Draw page header for each page.

       --markup
	      Interpret the text as pango markup.

       --encoding=ENCODING
	      Assume the documentation encoding is ENCODING.

       --lpi  Set the lines per inch. This determines the line spacing.

       --cpi  Set the characters per inch. This is an alternative method of specifying the font size.

       --stretch-chars
	      Indicates  that  characters  should be stretched in the y-direction to fill up their vertical space. This is similar to the texttops
	      behaviour.

AUTHOR

       paps was written by Dov Grobgeld <dov.grobgeld@gmail.com>.

       This manual page was written by Lior Kaplan <kaplan@debian.org>, for the Debian project (but may be used by others).

								  April  17, 2006							   PAPS(1)
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