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
grep
GREP(1) General Commands Manual GREP(1)NAME
grep - search a file for a pattern
SYNOPSIS
grep [ option ... ] pattern [ file ... ]
DESCRIPTION
Grep searches the input files (standard input default) for lines (with newlines excluded) that match the pattern, a regular expression as
defined in regexp(6). Normally, each line matching the pattern is `selected', and each selected line is copied to the standard output.
The options are
-c Print only a count of matching lines.
-h Do not print file name tags (headers) with output lines.
-i Ignore alphabetic case distinctions. The implementation folds into lower case all letters in the pattern and input before interpre-
tation. Matched lines are printed in their original form.
-l (ell) Print the names of files with selected lines; don't print the lines.
-L Print the names of files with no selected lines; the converse of -l.
-n Mark each printed line with its line number counted in its file.
-s Produce no output, but return status.
-v Reverse: print lines that do not match the pattern.
Output lines are tagged by file name when there is more than one input file. (To force this tagging, include /dev/null as a file name
argument.)
Care should be taken when using the shell metacharacters $*[^|()= and newline in pattern; it is safest to enclose the entire expression in
single quotes '...'.
SOURCE
/sys/src/cmd/grep.c
SEE ALSO ed(1), awk(1), sed(1), sam(1), regexp(6)DIAGNOSTICS
Exit status is null if any lines are selected, or non-null when no lines are selected or an error occurs.
GREP(1)
03-19-2014
