How to perform circshift on specific elements?

I have a much larger dataset but given A = [1 2 3 4; 5 6 7 8; 9 10 11 12], how can I use circshift on the odd rows and only columns 2 - 3 to move the values one column to the left. I know those values are indexed by A = A(1:2:end, 2:3); and the circshift should be circshift(A, [0 -1]) but I am having trouble putting it all together.

Answer 1

[Rik]

You are overwriting the original array, instead of using circshift on the partial array.

A = [1 2 3 4; 5 6 7 8; 9 10 11 12];
L = false(size(A));
L(1:2:end, 2:3) = true;
A_temp = A(L);
A_temp = circshift(A_temp, [0 -1]);
A(L) = A_temp;

%Or with more compact notation:
A = [1 2 3 4; 5 6 7 8; 9 10 11 12];
A(1:2:end, 2:3) = circshift(A(1:2:end, 2:3), [0 -1]);

disp(A)

     1     3     2     4
     5     6     7     8
     9    11    10    12

[hbcukid]

Wow, thank you.