# Reshaping array with specific order

4 views (last 30 days)
Prabhjot Dhami on 18 Oct 2021
Edited: dpb on 18 Oct 2021
Greetings,
I have a 2-D matrix that I would like to reshape into a 3-D array with specific ordering of the elements.
For example, if my 2-D matrix is
A = [1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20];
B = reshape(A, 2, 5, [])
ans(:,:,1) =
1 2 3 4 5
11 12 13 14 15
ans(:,:,2) =
6 7 8 9 10
16 17 18 19 20
However, the order I am looking for through reshape is:
ans(:,:,1) =
1 2 3 4 5
6 7 8 9 10
ans(:,:,2) =
11 12 13 14 15
16 17 18 19 20
Any help with how I can do this?
Thank you.
Chunru on 18 Oct 2021
Are you sure you have correct description of your problem?
A = [1 2 3 4 5; 6 7 8 9 10];
B = reshape(A, 2, 5, [])
B = 2×5
1 2 3 4 5 6 7 8 9 10

dpb on 18 Oct 2021
Edited: dpb on 18 Oct 2021
Can't be done with only reshape. You have only 10 elements in A and the requested output array requires 20.
OTOH, it's easy enough to produce the desired result by
>> A = [1 2 3 4 5; 6 7 8 9 10];
>> C=cat(3,A,A+10)
C(:,:,1) =
1 2 3 4 5
6 7 8 9 10
C(:,:,2) =
11 12 13 14 15
16 17 18 19 20
>>