How to subtract entire column of matrix

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Tim B
Tim B 2017-6-5
评论： Tim B 2017-6-5
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?

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the cyclist
the cyclist 2017-6-5
[2*a(1)-sum(a) 2*b(1)-sum(b)]

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