how to create block circulant matrix?

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

Answer 1

[Akira Agata]

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);

[sai prudhvi]

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

[Akira Agata]

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);