MATLAB: How to subtract a number from a previous one

Question

given a set of number 1, 0.75, 0.50, 0.6

I want a code that could compute the following given the first value as 1

for instance the code will generate the following answers

n1 = 1

n2 = 0.75 – n1

n3 = 0.5 – n2

n4 = 0.6 – n3

Your answers will be greatly appreciated.

Thanks in advance

Answer 1

x = [1;.75;.5;.6];
n = filter(1,[1;1],x);

or

out = tril(toeplitz(x))*(-1).^(2:numel(x)+1).';

or

n = x;
for jj = 2:numel(x)
    n(jj) = x(jj) - n(jj-1);
end