MATLAB Answers

How to reshape matrix 2 columns by 2 columns

1 view (last 30 days)
Ren Li
Ren Li on 30 Jul 2020
Answered: Bruno Luong on 2 Aug 2020
for example, an array like this:
1 0 2 0 2 3
5 4 4 0 1 4
4 2 2 4 2 2
1 1 0 4 3 1
How to reshape it into an array like this:
1 0
5 4
4 2
1 1
2 0
4 0
2 4
0 4
2 3
1 4
2 2
3 1

  0 Comments

Sign in to comment.

Accepted Answer

Sriram Tadavarty
Sriram Tadavarty on 30 Jul 2020
Hi Ren,
Use individual columns and append them. For the sample code you provided, it can be done as below:
a = [1 0 2 0 2 3;
5 4 4 0 1 4;
4 2 2 4 2 2;
1 1 0 4 3 1];
a1 = a(:,1:2:end); % Select the odd numbered columns
a2 = a(:,2:2:end); % Select the even numbered columns
[a1(:) a2(:)] % Append them
Hope this helps.
Regards,
Sriram

  4 Comments

Show 1 older comment
madhan ravi
madhan ravi on 30 Jul 2020
Sriram how’s this different from my answer?
Sriram Tadavarty
Sriram Tadavarty on 30 Jul 2020
Hi Madhan,
I wasn't aware that there was another answer provided by the time i answered it. Looking at your answer now, yes, both are equivalent. Mine has some additional comments.
If i knew that this is already answered, i wouldn't have answered it at all. I think we both looked at the same time, but my answer publish went late by couple of mins.
Sorry for any trouble here. I didn't do anything intentional. I am even ok, if you wanted yours to be an accepted answer, as you mentioned early enough. My answer has just some additional comments.
Thanking you.
Regards,
Sriram
madhan ravi
madhan ravi on 30 Jul 2020
No problem Sriram ;). By the way I think concatenate could be used instead of append I believe. Append is something which is used for adding something at the end of already existing variable/array.

Sign in to comment.

More Answers (3)

Walter Roberson
Walter Roberson on 30 Jul 2020
cell2mat(mat2cell(YourArray, size(YourArray,1), 2*ones(1,size(YourArray,2)/2)).')

  1 Comment

Ren Li
Ren Li on 2 Aug 2020
Thank you very much for the code, after spending sometime understanding it, I believe this gives even more flexibility on how to rearrange the matrix, now with this code, I can easily reshape it N columns by N columns, which in my case is exactly what I will need to do next. So again thank you so much

Sign in to comment.


madhan ravi
madhan ravi on 30 Jul 2020
First = matrix(:, 1:2:end);
Second = matrix(:, 2:2:end);
Wanted = [First(:), Second(:)]

Bruno Luong
Bruno Luong on 2 Aug 2020
You want a reshape? Here is reshape method:
B = reshape(permute(reshape(A,size(A,1),2,[]),[1 3 2]),[],2)

  0 Comments

Sign in to comment.

Products


Release

R2018a

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!