repeat a matrix as digonal element in a new matrix?

2012 5 30
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更新时间：2022 1 24
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Hi
I have a 2D matrix, and I want repeat it a digonal element in a new matrix., somthing like this:
A is 2*3 matrix , and we want reapeat for 10 time like:
B= [ A 0 0 .....0; 0 A 0 .....0; .............. ;0 0 0 ........A]
hence B is a 20*30 matrix. How can make B without using "for"?

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Titus Edelhofer
Titus Edelhofer 2012-5-30

9 个投票

Hi,
I usually use blkdiag:
A = rand(2,3);
ACell = repmat({A}, 1, 10);
BigA = blkdiag(ACell{:});
Titus

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