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Full Discussion: How to print median values of matrix -awk?
Top Forums Shell Programming and Scripting How to print median values of matrix -awk? Post 302999545 by quincyjones on Thursday 22nd of June 2017 10:51:34 AM
Old 06-22-2017
How to print median values of matrix -awk?
I use the following script to print the sum and how could I extend this to print medians instead? thanks

Code:
name	s1	s2	s3	s4
g1	2	8	6	5
g1	5	7	9	9
g1	6	7	8	9
g2	8	8	8	8
g2	7	7	7	7
g2	10	10	10	10
g3	3	12	1	24
g3	5	5	24	48
g3	12	3	12	12
g3	2	3	3	3



output
Code:
name	s1	s2	s3	s4
g1	5	7	8	9
g2	7	7	7	7
g3	4	4	7.5	18


scripts - mean

Code:
NR==1 {
    print
    next
}
    # print average of each column per year
    #  then, reset columns sums and number of lines
function print_sum() {
    printf prev
    # needs GNU awk, for length of array
    for (i=2; i < length(sum) + 2; i++) {
            printf FS sum[i]/nlines
            sum[i] = 0
    }
    printf ORS
    nlines = 0
}
    # print average when $1 changes, but not the first time
    # also, on end of script
NR>2 && prev!=$1 { print_sum() }
END              { print_sum() }
    # for every line with the same $1, sum column values, increment number of lines
{
    prev=$1;
    nlines++
    for (i=2; i <= NF; i++) {
            sum[i]+=$i
    }
}
}

 

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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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