How to increase the size of a matrix within for loop

Consider creating a cell array to store the pieces you want to be placed on the main diagonal. When you want to assemble the matrix call blkdiag, creating a comma-separated list of input arguments using the cell array.

C = {1, [1 2;2 1], [1 2 3; 2 3 1; 3 1 2]};
P = blkdiag(C{1})
P = 1
Q = blkdiag(C{1:2})
Q = 3×3
     1     0     0
     0     1     2
     0     2     1
R = blkdiag(C{1:3})
R = 6×6
     1     0     0     0     0     0
     0     1     2     0     0     0
     0     2     1     0     0     0
     0     0     0     1     2     3
     0     0     0     2     3     1
     0     0     0     3     1     2
S = blkdiag(C{:})
S = 6×6
     1     0     0     0     0     0
     0     1     2     0     0     0
     0     2     1     0     0     0
     0     0     0     1     2     3
     0     0     0     2     3     1
     0     0     0     3     1     2

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Pooneh Shah Malekpoor 2021-5-13

编辑：Pooneh Shah Malekpoor 2021-5-13

Great! Could you please tell me how can i store each of the cell arrays in the matrix C? i mean how can i ask matlab to store [ 1 2;2 1] in the second array of C, then store [1 2 3; 2 3 1; 3 1 2] in the third array and so forth?

C = {1, [1 2;2 1], [1 2 3; 2 3 1; 3 1 2]}

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