MATLAB: Delete the center in an array

delete an array

Hi everybody,
I have an array, let's say 6×6, how to delete the center of this array. I mean I want to delete 3×3 center of this array.
simple example, if we have an array 6×6 with elements:
    6  5  2  2  1  9
    4  3  0  1  2  8
    5  5  6  2  1  7
    9  8  0  1  0  6
    4  4  1  1  0  5
    2  1  1  2  3  4
and I want to delete the center which are:
6 2
0 1
I hope you could help me, I've tried several time to solve it but I couldn't.
Thanks in advance.

Best Answer

‘I want to delete specific elements(3x3 or 2x2 whatever) inside a big array, and convert the rest of this array into a vector.’
That is straightforward:
A = [6  5  2  2  1  9
     4  3  0  1  2  8
     5  5  6  2  1  7
     9  8  0  1  0  6
     4  4  1  1  0  5
     2  1  1  2  3  4];
Lidx = sub2ind(size(A), [3 3; 4 4], [3 3; 4 4]);
Center = A(Lidx)                                            % View Elements
A(Lidx) = [];                                               % Delete Elements, Return Vector
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