how to create block circulant matrix?

Question

sai prudhvi 2020-4-14

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https://ww2.mathworks.cn/matlabcentral/answers/517709-how-to-create-block-circulant-matrix

评论： Akira Agata 2020-4-15

采纳的回答： Akira Agata

i need to create mn*mn block circulant matrix ie m blocks of n*n matrices. please help me

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Answer 1

Akira Agata 2020-4-14

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https://ww2.mathworks.cn/matlabcentral/answers/517709-how-to-create-block-circulant-matrix#answer_425926

在 MATLAB Online 中打开

How about the following?

% For simple example
n = 3;
m = 2;
% Create n-by-n circulant matrix
B_block = gallery('circul',1:n)';
% Create nm-by-nm block circulant matrix
B_all = repmat(B_block,m);

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sai prudhvi 2020-4-14

i accept but if matrix elements is complex numbers then how to create the matrix.

Akira Agata 2020-4-15

在 MATLAB Online 中打开

I believe the same approach should work, like:

% For simple example
n = 3;
m = 2;
% Create n-by-n complex circulant matrix
Re = gallery('circul',1:n)';
Im = gallery('circul',1:n)';
B_block = Re + 1i*Im;
% Create nm-by-nm block circulant matrix
B_all = repmat(B_block,m);