repeat a matrix as digonal element in a new matrix?

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"?

Answer 1

[Titus Edelhofer]

Hi,

I usually use blkdiag:

A = rand(2,3);
ACell = repmat({A}, 1, 10);
BigA = blkdiag(ACell{:});

Titus

[smabtahi]

Thanks a lot Titus.

This apprich is working very fast for large matrixes.

[CLOUDY LU]

Very useful! Thanks a lot.

[Muhammad Fiaz]

Thank you sir.

Answer 2

[Walter Roberson]

blkdiag() or possibly kron()

[Qingyu]

Thank you.