Question

I’ve a set of matrices stored in text files. I would like to compute an output matrix resulting of the element-wise averages of the input matrices. An illustration is given below:

cat file1.txt
Item0 Item1
Item0 1.01456e+06 5
Item1 2 12.2


cat file2.txt
Item0 Item1
Item0 1.0274e+06 6
Item1 0 14.5


cat output.txt
Item0 Item1
Item0 1020980 5.5
Item1 1 13.35

Note that some of the values in the input matrices are in engineering notation.
All suggestions are welcomed!

Answer 1

awk -v row=2:3 -v col=2:3 -v num=2 '

BEGIN {
    split(row, r, ":")
    split(col, c, ":")
    n = num
}

r[1]<=FNR && FNR<=r[2] {
    for(i=c[1];i<=c[2];i++)
    {
        m[FNR,i]+=$i
    }
}

END {
    for(i=r[1];i<=r[2];i++)
    {
        for(j=c[1];j<=c[2];j++)
        {
            printf("%f\t", m[i,j]/n)
        }
        print ""
    }
}' file{1,2}.txt

---

1020980.000000  5.500000
1.000000        13.350000