Discover MakerZone

MATLAB and Simulink resources for Arduino, LEGO, and Raspberry Pi

Learn more

Discover what MATLAB® can do for your career.

Opportunities for recent engineering grads.

Apply Today

How to use reshape in specific case

Asked by Jan on 13 May 2013

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

0 Comments

Jan

Products

No products are associated with this question.

1 Answer

Answer by James Tursa on 13 May 2013
Edited by James Tursa on 13 May 2013
Accepted answer

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.

3 Comments

Jan on 14 May 2013

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 on 14 May 2013

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 on 14 May 2013
C = reshape(permute(A,[2 1 3]),3,[])'
A = permute(reshape(C,3,3,[]),[1 3 2])
James Tursa

Contact us