[Numpy-discussion] how to create a block diagonal matrix by repeating the block?

Jose Borreguero borreguero@gmail....
Thu Aug 11 18:43:12 CDT 2011

Dear numpy users,

I have a 3x3 matrix which I want to repeat 50 times along a diagonal, thus
creating a 150x150 block diagonal matrix.

I know of a method usin scipy.linalg.block_diag, but I don't know if this is
the best one:
a = random.randn(3,3)
b = a.reshape(1,3,3).repeat(50,axis=0)
scipy.linalg.block_diag( *b )

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