# How to reshape matrix in this way?

4 views (last 30 days)
John on 12 Nov 2014
Edited: Roger Stafford on 13 Nov 2014
When reshape a 3D matrix into 2D matrix, it fills columns first; for example:
a(3,3,4) =
1 1 1
1 1 1
1 1 1
2 2 2
2 2 2
2 2 2
3 3 3
3 3 3
3 3 3
4 4 4
4 4 4
4 4 4
reshape(a,6,6) gives:
d =
1 1 2 3 3 4
1 1 2 3 3 4
1 1 2 3 3 4
1 2 2 3 4 4
1 2 2 3 4 4
1 2 2 3 4 4
How can it be reshaped to:
d =
1 1 1 3 3 3
1 1 1 3 3 3
1 1 1 3 3 3
2 2 2 4 4 4
2 2 2 4 4 4
2 2 2 4 4 4
or
d =
1 1 1 2 2 2
1 1 1 2 2 2
1 1 1 2 2 2
3 3 3 4 4 4
3 3 3 4 4 4
3 3 3 4 4 4
Thanks.

Roger Stafford on 13 Nov 2014
Edited: Roger Stafford on 13 Nov 2014
I think this does it for the first of your desired d's:
d = reshape(permute(reshape(a,3,3,2,2),[1,3,2,4]),6,6);
The second desired d should be obtained with:
d = reshape(permute(reshape(a,3,3,2,2),[1,4,2,3]),6,6);

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