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A=[1 2;3 4];B=[5 6;7 8];C=[9 10;11 12];n=6;
y=f(A,B,C,n)
function y=f(A,B,C,n)
%生成[B C
% A B C
% A B C
% . . .
% . . .
% A B C
% B C]
[n1,n2]=size(A);
y=zeros(n*n1,n*n1);
for i=2:n-1
y((i-1)*n1+1:i*n1,(i-2)*n1+1:(i-1)*n1)=A;
y((i-1)*n1+1:i*n1,(i-1)*n1+1:i*n1)=B;
y((i-1)*n1+1:i*n1,i*n1+1:(i+1)*n1)=C;
end
y(1:n1,1:n1)=B;y(1:n1,n1+1:2*n1)=C;
y((n-1)*n1+1:n*n1,(n-1)*n1+1:n*n1)=B;
y((n-1)*n1+1:n*n1,(n-2)*n1+1:(n-1)*n1)=A;
y =
5 6 9 10 0 0 0 0 0 0 0 0
7 8 11 12 0 0 0 0 0 0 0 0
1 2 5 6 9 10 0 0 0 0 0 0
3 4 7 8 11 12 0 0 0 0 0 0
0 0 1 2 5 6 9 10 0 0 0 0
0 0 3 4 7 8 11 12 0 0 0 0
0 0 0 0 1 2 5 6 9 10 0 0
0 0 0 0 3 4 7 8 11 12 0 0
0 0 0 0 0 0 1 2 5 6 9 10
0 0 0 0 0 0 3 4 7 8 11 12
0 0 0 0 0 0 0 0 1 2 5 6
0 0 0 0 0 0 0 0 3 4 7 8
