repeat a matrix as digonal element in a new matrix?

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smabtahi
smabtahi 2012-5-30
评论： Muhammad Fiaz 2022-1-24
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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采纳的回答

Titus Edelhofer
Titus Edelhofer 2012-5-30
Hi,
I usually use blkdiag:
A = rand(2,3);
ACell = repmat({A}, 1, 10);
BigA = blkdiag(ACell{:});
Titus

更多回答（1 个）

Walter Roberson
Walter Roberson 2012-5-30
blkdiag() or possibly kron()

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