use array vector to form a diagonal matrix

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SYED SHAZAIB
SYED SHAZAIB 2023-1-1
编辑： DGM 2023-1-1
For diag() function(https://ww2.mathworks.cn/help/matlab/ref/diag.html) the vector 'v' is used to form a diagonal matrix, but 'v' have single elements( i.e. v = [2 1 -1 -2 -5]). I want to use 'v' which has {2x2} array matrices as it's elements to creat a diagonal matrix i.e. [{2x2} {2x2} {2x2} {2x2} {2x2}].

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回答（1 个）

DGM
DGM 2023-1-1
编辑：DGM 2023-1-1
Ran in:
It seems to me like maybe you're talking about what blkdiag() does.
A = [1 2; 3 4];
B = A*11;
C = A*111;
D = blkdiag(A,B,C) % block-diagonal concatenation
D = 6×6
1 2 0 0 0 0 3 4 0 0 0 0 0 0 11 22 0 0 0 0 33 44 0 0 0 0 0 0 111 222 0 0 0 0 333 444
If your input v is some sort of cell array, you'll have to manage that, but it's not really clear to me how you have that arranged. Say you have a cell vector of numeric matrices:
v = {A B C}; % same thing, but in a cell
D = blkdiag(v{:}) % same thing
D = 6×6
1 2 0 0 0 0 3 4 0 0 0 0 0 0 11 22 0 0 0 0 33 44 0 0 0 0 0 0 111 222 0 0 0 0 333 444

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