extract elements from four matrices and create new matrix

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I have four matrices of 4*4 order.
For example, the matrices are like [1 2 3 4; 2 3 4 1; 2 2 1 1; 1 2 1 0]
I want to extract the first element of all the four matrices and place it a 2*2 order matrix
repeat for each element and get a 2*2 matrix. how to store all such matrices of order 2*2 in a single 3D matrix?
can someone help me in writing the code?
  2 个评论
Bob Thompson
Bob Thompson 2019-1-29
I don't use it often enough to know the exact command, but I'm fairly sure you can do this with reshape().

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回答(2 个)

Andrei Bobrov
Andrei Bobrov 2019-1-29
编辑:Andrei Bobrov 2019-1-29
Let A,B,C,D - your matrix (4 x 4).
out = reshepe(permute(cat(3,A,B,C,D),[3,1,2]),2,2,[]);
or
out = reshepe(permute(cat(3,A,B,C,D),[3,2,1]),2,2,[]);

Guillaume
Guillaume 2019-1-29
编辑:Guillaume 2019-1-29
If your 4 4x4 matrices are not already stored as 4x4x4 3D array, well why not? and make them so:
matrices = cat(3, m1, m2, m3, m4); %or if they are in a cell array cat(3, yourcellarray{:})
then it's not clear which order you want the elements to go in the 2x2 matrix, either
[1 3
2 4]
or
[1 3
2 4]
Either way, it's trivial to get your 2x2x16 array:
result = reshape(permute(matrices, [3 1 2]), [2 2 16])
replace [3 2 1] by [3 1 2] if you want the other option.

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