Block Diagonal

version 1.0.0 (1.68 KB) by Lateef Adewale Kareem
This code allows you to process block diagonal elements. Its like the generalization of inbuilt diag.

3 Downloads

Updated 27 May 2022

View License

% 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)

Cite As

Lateef Adewale Kareem (2022). Block Diagonal (https://www.mathworks.com/matlabcentral/fileexchange/112325-block-diagonal), MATLAB Central File Exchange. Retrieved .

MATLAB Release Compatibility
Created with R2022a
Compatible with any release
Platform Compatibility
Windows macOS Linux

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!