|||
a=[1 2; 3 4];
b1=repmat(a,2); % 复制成2-by-2 block
->
1 2 1 2
3 4 3 4
1 2 1 2
3 4 3 4
b2=repmat(a,2,1); % 复制成2-by-1 block
->
1 2
3 4
1 2
3 4
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