How to receive the inverse of the diff(x) array calculation ?

For example ,if x=[a,b,c,d] and diff(x)=[b-a,c-b,d-c],

is there any possible way for [a-b,b-c,c-d].

Answer 1

[Torsten]

x = [4 6 9 13];
s1 = -diff(x)

s1 = 1×3

-2 -3 -4

s2 = [x(1)-x(2),x(2)-x(3),x(3)-x(4)]

s2 = 1×3

-2 -3 -4

[Anwar]

In the code i have x as a decision variable (without any values) of k=10 elements. any ideas ?

[Torsten]

x = sym('x',[1 10])

x = 

d = x(1:end-1)-x(2:end)

d =