How do I extract 3D matrix from 5D matrix

Hi everyone !

I working on 5D matrix configured as follow : [nt, nx, ny, np, nz]=size(D), such nt= 301; nx=12; ny=12; np=12; nz=12. I need to extract two matrices from D.

• the first one A of size : [nt, nx, ny]=size(A);
• the second B of size ; [nt, np, nz] =size(B);

Is there any Matlab code to extract these 3D matrices from D ?

Answer 1

[John D'Errico]

What does it mean to extract a specific matrix?

p = 1;
z = 1;
A = D(:,:,:,p,z);

is a matrix of the desired size, extracting the (p,z) submatrix from D. But you may mean something completely different.

For the latter, you need to learn how to use squeeze.

x = 1;
y = 1;
B = squeeze(D(:,x,y,:,:));

Time to read the manual for you, since you need to learn about indexing matrices, something basic.

[Yapo OBOUE]

Thanks very much dear John D'Errico. It works very as I wanted. Thank a lot.