block diagonal matrix in the opposite diagonal

Question

Romio 2022-9-18

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https://ww2.mathworks.cn/matlabcentral/answers/1807495-block-diagonal-matrix-in-the-opposite-diagonal

评论： Romio 2022-9-18

Is there any function/way to construct a matrix with block matrcies in the opposite diagonal. I know of blkdiag( ) but it gives a matrix with blocks in the main diagonal

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Answer 1

Paul 2022-9-18

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Here's one option

a = rand(2);
b = rand(2,3);
A = blkdiag(a,b)
A = 4×5
    0.0976    0.7033         0         0         0
    0.6779    0.8610         0         0         0
         0         0    0.4852    0.7807    0.6937
         0         0    0.5431    0.4091    0.2433
D = oppblkdiag(a,b)
D = 4×5
         0         0         0    0.0976    0.7033
         0         0         0    0.6779    0.8610
    0.4852    0.7807    0.6937         0         0
    0.5431    0.4091    0.2433         0         0
function D = oppblkdiag(varargin)
c = cellfun(@(x) fliplr(x),varargin,'UniformOutput',false);
D = fliplr(blkdiag(c{:}));
end