## Block Diagonal

This code allows you to process block diagonal elements. Its like the generalization of inbuilt diag.

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% if size(v,2) == n
% D = diag(v) returns a square diagonal matrix with the block
% (m-by-n) elements of matrix v when on the main diagonal.
% D = diag(v, k) places the (m-by-n) elements of vector v on the kth
% block diagonal. k = 0 represents the main diagonal, k > 0 is above
% the main diagonal, and k<0 is below the main diagonal.
% end
% if size(v,2) > n
% D = diag(v) returns a matrix size(v, 1)-by-n made of block
% (m-by-n) main diagonal elements of matrix v.
% D = diag(v, k) extracts (m-by-n) block elements from matrix v on the
% kth block diagonal. k = 0 represents the main diagonal, k > 0 is above
% the main diagonal, and k<0 is below the main diagonal.
% end
% Note that if v has just 1 column, m = 1, and n = 1, then BlockDiag
% behaves exactly like the inbuilt function Diag.
A = rand(12);
v1 = BlockDiag(A, 2, 2)
v2 = BlockDiag(A, 2, 2, 1)
v3 = BlockDiag(A, 3, 2, -1)
v = rand(12,3);
D1 = BlockDiag(v, 3, 3)
D2 = BlockDiag(v, 3, 3, -1)
D3 = BlockDiag(v, 4, 3, 1)

### 引用格式

Lateef Adewale Kareem (2023). Block Diagonal (https://www.mathworks.com/matlabcentral/fileexchange/112325-block-diagonal), MATLAB Central File Exchange. 检索来源 .

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