Shift array by one element backwards or forward

For example, I have an array indexed by n, running from -n to +n

A_n=[-n,..-1,0,1,.....]

I want to create a new array A_{n+1} which will shift every element of A_n one place forward

and A_{n-1} which will shift every element of A_n one place backwards.

How to do it?

Answer 1

[Bhaskar R]

x = -5:5;   % array
fr = circshift(x, 1);   % forward
bk = circshift(x, -1);  % backward

[John Jarvis]

doesnt work in Matlab 2014a:

Warning: CIRCSHIFT(X,K) with scalar K and where size(X,1)==1 will change behavior in future versions. To

retain current behavior, use CIRCSHIFT(X,[K,0]) instead.

[Bhaskar R]

"Warning: CIRCSHIFT(X,K) with scalar K and where size(X,1)==1 will change behavior in future versions. To

retain current behavior, use CIRCSHIFT(X,[K,0]) instead. "

As warning suggested modify command as

x = -5:5;   % array
fr = circshift(x, [0, 1]);   % forward
bk = circshift(x, [0, -1]);  % backward

[Captain Karnage]

So this depends on whether you have a horizontal or vertical vector. @Bhaskar R's example works for a horizontal vector (-5:5 will give you a horizontal vector). For a vertical vector it will be just like the suggestion in the warning:

x = -5:5;   % array
fr = circshift(x, [1, 0]);   % forward
bk = circshift(x, [-1, 0]);  % backward

I can confirm that is what worked for me.