One line code to alternate diff

Hi everyone. I know that diff(x) produces the difference in x elements.

Now lets say I want to produce the difference of every 2 elements in x? Or even 3 elements.....rather than 1 (in the case of diff).

Could can body know how to do this?

Thanks

Answer 1

[Titus Edelhofer]

Hi,

not sure, if I understood correctly, but does this what you need?

% some data
x = 1:10;
% n = 2 or 3 or ...
n = 2;
% build the difference ...
dx = x(n+1:end) - x(1:end-n)

This would work for vectors only, but generalization to matrices is of course straigt forward ...

Titus