How to subtract entire column of matrix

Suppose I have a 5x2 matrix such as

a = [1.20;.976;.833;.702;.543];
b = [1663;1058;953;802;744];
z = [a,b];

I want subtract each column such that 1.20 - .976 - .833 - .702 - .543 and 1663 - 1058 - 953 - 802 - 755

The main goal is to get a 1x2 matrix with the difference of these columns which in this case would be

[-1.854,-1905]

I tried using the diff and sum command but they would just add everything up which isn't the same as subtracting each value. I know I can easily use a calculator to find this answer but if I had a 20x2 matrix it wouldn't be as practical.

What would be the simplest way to calculate this?

Answer 1

[the cyclist]

[2*a(1)-sum(a) 2*b(1)-sum(b)]

[Tim B]

Thank you!