BASH

Using only pure BASH, write a function called mean that will take one M x N matrix with an unknown number of rows and columns and return a one row vector where the means are given for each column as integers seperated by tabs (the first element is the mean of column 1, the second element is the mean of column 2, etc).

The input matrix will be integers seperated by tabs:

1\t2\t3

4\t5\t6

7\t8\t9

Given a sample matrix:

After running our program, we get:

The output is seperated by tabs.

The input must be a matrix of unknown size and this script must return the mean of the columns as seen above.

AWK, Python, and other embedded languages are not allowed.

$ cat m1 1 5 2 4 7 $ cat m1 1 5 2 4 7