Convert 2D into 3D matrix

Hey everyone,

I need to convert a 2D into a 3D matrix. The initial dimensions are nx64 (the first number is always random) and it needs to be transformed into 4x16xn, but in this order:

1  5  9  13 17 ... 61
2  6  10 14 18 ... 62
3  7  11 15 19 ... 63
4  8  12 16 20 ... 64

and

1  2  3  4  5  ... 16
17 18 19 20 21 ... 32
33 34 35 36 37 ... 48
49 50 51 52 53 ... 64

The third dimension should be the n rows from the original matrix. Can someone help me with both cases?

Answer 1

[Azzi Abdelmalek]

reshape(A(:),16,[])'

Answer 2

[KSSV]

You can use reshape to convert 2D matrix into 3D. But remember that the number of elements should not vary.

clc; clear all;
d = 1:64 ;
% 2D matrix
d2D = reshape(d,4,[]) ;  % let the MATLAB decide the number of columns
% 2D to 3D
d3D = reshape(d2D,4,8,[]); 
% fix the number of rows and columns and let matlab decide the number of matrices in 3D