MATLAB: How to create a block diagonal matrix from the slices of a 3D matrix

block matrix from a 3d matrix

I have a large 3D matrix (K) composed of 200 slices , and I want to create a block diagonal matrix from the slices of it without looping. For example
K(:,:,1) =[1 2;3 4]
K(:,:,2) =[5 6;7 8]
K(:,:,3) =[9 10;11 12]
.
.
.
K(:,:,200) =[1 10;13 15]
if we assume the number of slice is 3, the output should be
       1     2     0     0     0     0
       3     4     0     0     0     0
       0     0     5     6     0     0
       0     0     7     8     0     0
       0     0     0     0     9    10
       0     0     0     0    11    12
But how the block diagonal matrix created from all the 200 slices without looping?

Best Answer

k(:,:,1) =[1 2;3 4]
k(:,:,2) =[5 6;7 8]
k(:,:,3) =[9 10;11 12]
q=num2cell(k,[1,2])
blkdiag(q{:})
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