MATLAB Programming

1 Data Structures
A = [1:8; 11:18; 21:28; 31:38; 41:48]
A =
1 2 3 4 5 6 7 8
11 12 13 14 15 16 17 18
21 22 23 24 25 26 27 28
31 32 33 34 35 36 37 38
41 42 43 44 45 46 47 48
B = circshift(A, [0, 3])
B =
6 7 8 1 2 3 4 5
16 17 18 11 12 13 14 15
26 27 28 21 22 23 24 25
36 37 38 31 32 33 34 35
46 47 48 41 42 43 44 45
Now take A and shift it along both dimensions: three columns to the right
and two rows up:
A = [1:8; 11:18; 21:28; 31:38; 41:48];
B = circshift(A, [-2, 3])
B =
26 27 28 21 22 23 24 25
36 37 38 31 32 33 34 35
46 47 48 41 42 43 44 45
6 7 8 1 2 3 4 5
16 17 18 11 12 13 14 15
Since circshift circulates shifted rows and columns around to the other end
of a matrix, shifting by the exact size of A returns all rows and columns to
their original location:
B = circshift(A, size(A));
all(B(:) == A(:)) % Do all elements of B equal A?
ans =
1 % Yes
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