From Matlab documentation:
Y = diff(X)
calculates differences between adjacent elements of X.
Examples:
The quantity diff(y)./diff(x) is an approximate derivative.
x = [1 2 3 4 5];
y = diff(x)
y =
1 1 1 1
z = diff(x,2)
z =
0 0 0
Given,
A = rand(1,3,2,4);
diff(A) is the first-order difference along dimension 2.
diff(A,3,4) is the third-order difference along dimension 4.
