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Repeat 3D matrix in 4D

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Hello,
I suppose it is not hard, but I need to repeat 3D matrix a (NxMxL) in to 4D b (NxMxMxL). What I need is to repeat each 2D page of 3D matrix M times (which is columns) in 4D. If try:
b=repmat(a,1,1,1,L) ;
Result is b (NxMxLxL), what would be the correct way to do this?

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Accepted Answer

Walter Roberson
Walter Roberson on 18 Jul 2018
b = repmat( reshape(a, size(a,1), size(a,2), 1, size(a,3)), 1, 1, size(a,2), 1);

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Mantas Vaitonis
Mantas Vaitonis on 18 Jul 2018
Yes this is exactly what I need.

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