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Full Discussion: AWK - averaging $3 by info in $1
Top Forums Shell Programming and Scripting AWK - averaging $3 by info in $1 Post 302253170 by itisthus on Friday 31st of October 2008 05:57:20 AM
Old 10-31-2008
AWK - averaging $3 by info in $1
Hello,

I have three columns of data of the format below:
<name> <volume> <size>
a 2 1.2
a 2 1.1
b 3 1.7
c 0.7 1.9
c 0.7 1.9
c 0.7 1.8

What I want as output is:
<name> <volume/number of sizes recorded> <average size>
a 1 1.15
a 1 1.15
....

i.e. I want get an average of column three, the size, for each name, divide the volume by the number of records represented by the name and then print name, volume scaled by number of records per name and average size.

So far I have this, which doesn't run properly:
Quote:
awk '
{
while (i <= NR) {
NR = NR + n
erup = $1
mod = 1
n = 0
while (mod > 0) {
if ($1 ~ erup) {
sum += $2
n++
i++
}
else {
print erup, sum/n
sum = 0
mod = 0
}
}
}}' test.d > avout
The challenge, as I see it, is to store information about the previous record in awk so that in looking at the next record it can decide whether to continue summing or stop, divide through to get the average, print and start over.

Any help would be greatly appreciated. Thank you,
 

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LEARN ABOUT OPENSOLARIS

sum

sum(1B) 					     SunOS/BSD Compatibility Package Commands						   sum(1B)

NAME

       sum - calculate a checksum for a file

SYNOPSIS

       /usr/ucb/sum file...

DESCRIPTION

       sum  calculates	and  displays a 16-bit checksum for the named file and displays the size of the file in kilobytes. It is typically used to
       look for bad spots, or to validate a file communicated over some transmission line. The checksum is calculated by an  algorithm	which  may
       yield different results on machines with 16-bit ints and machines with 32-bit ints, so it cannot always be used to validate that a file has
       been transferred between machines with different-sized ints.

USAGE

       See largefile(5) for the description of the behavior of sum when encountering files greater than or equal to 2 Gbyte ( 2^31 bytes).

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWscpu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       sum(1), wc(1), attributes(5), largefile(5)

DIAGNOSTICS

       Read error is indistinguishable from EOF on most devices; check the block count.

NOTES

       sum and /usr/bin/sum (see sum(1)) return different checksums.

       This utility is obsolete.

SunOS 5.11							    8 Nov 1995								   sum(1B)
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