Corner Case
Write a function called corners that takes a matrix as an input argument and returns four
outputs: the elements at its four corners in this order: top_left, top_right, bottom_left and
bottom_right. (Note that loops and if-statements are neither necessary nor allowed as we
have not covered them yet.) See an example run below:
>> [a, b, c, d] = corners([1 2; 3 4])
a =
1
b =
2
c =
3
d =
4
