How to use reshape in specific case

Hi all, can anyone help me with reshaping 3D matrix to 2D in way shown below? Lets say I have a 3D matrix A (A = round(rand(3,3,3)*10))
A(:,:,1) =
0 8 7
1 9 4
1 3 5
A(:,:,2) =
7 5 5
10 7 7
8 4 0
A(:,:,3) =
2 7 4
5 8 8
2 4 6
And i want a 2D matrix C C =
0 8 7
1 9 4
1 3 5
7 5 5
10 7 7
8 4 0
2 7 4
5 8 8
2 4 6
Thank you for any input for this problem

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James Tursa
James Tursa 2013년 5월 13일
편집: James Tursa 2013년 5월 13일

0 개 추천

For your specific example,
reshape(permute(A,[1 3 2]),9,3)
Alter the last two dimensions to fit your actual problem. The purpose of the permute in the above expression is to get the 3rd dimension next to the 1st dimension in memory, and then a simple reshape will finish the job.

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Jan
Jan 2013년 5월 14일
Thank you for your reply. Another liked question. How to do this in reverse? lets say I have a previosly created 2D matrix and I want to create 3D matrix. I am still not quite sure how to use permute.
Jan
Jan 2013년 5월 14일
Never mind spend another 14 minutes to think of it twice. I appreciate yor help.
This worked
C = reshape(permute(B,[2 1]),3,3,3); NewC = permute(C, [2,1,3])
Andrei Bobrov
Andrei Bobrov 2013년 5월 14일
편집: Andrei Bobrov 2013년 5월 14일
C = reshape(permute(A,[2 1 3]),3,[])'
A = permute(reshape(C,3,3,[]),[1 3 2])

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Jan
2013년 5월 13일

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