I am trying to calculate the median of a column of numbers if they match an ID type on a different column. The input file has 3 columns. The column that has the ID is column 1 and the column with the values I'd like to find the median for is column 3. The file does not need to be sorted.
What I have so far is this:
Code:
awk '
NR==1 {
print "id", "col2", "col3", "median"
next
}
FNR==NR {
A[$1]++
id=$1
($1 in A){
B[i++]=$3;} END {print B[int(i/2)];}}' file
the input looks like this :
Code:
id col2 col3
dog 0 0
dog 1 4
dog 2 3
cat 0 2
cat 1 4
the output should look like this:
Code:
id col2 col3 median
dog 0 0 3
dog 1 4 3
dog 2 3 3
cat 0 2 3
cat 1 4 3
Moderator's Comments:
Please use CODE tags (not QUOTE tags) to mark input and output samples as well as code samples.
Last edited by Don Cragun; 03-19-2014 at 05:12 PM..
Reason: Change QUOTE tags to CODE tags.
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LEARN ABOUT PLAN9
pr
PR(1) General Commands Manual PR(1)NAME
pr - print file
SYNOPSIS
pr [ option ... ] [ file ... ]
DESCRIPTION
Pr produces a printed listing of one or more files on its standard output. The output is separated into pages headed by a date, the name
of the file or a specified header, and the page number. With no file arguments, pr prints its standard input.
Options apply to all following files but may be reset between files:
-n Produce n-column output.
+n Begin printing with page n.
-b Balance columns on last page, in case of multi-column output.
-d Double space.
-en Set the tab stops for input text every n spaces.
-h Take the next argument as a page header (file by default).
-in Replace sequences of blanks in the output by tabs, using tab stops set every n spaces.
-f Use formfeeds to separate pages.
-ln Take the length of the page to be n lines instead of the default 66.
-m Print all files simultaneously, each in one column.
-n Number the lines of each file.
-on Offset the left margin n character positions.
-sc Separate columns by the single character c instead of aligning them with white space. A missing c is taken to be a tab.
-t Do not print the 5-line header or the 5-line trailer normally supplied for each page.
-wn For multi-column output, take the width of the page to be n characters instead of the default 72.
SOURCE
/sys/src/cmd/pr.c
SEE ALSO cat(1), lp(1)PR(1)
03-19-2014
