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Convert 2D into 3D matrix

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Dina Trajkovska
Dina Trajkovska 2016-8-16
回答： KSSV 2016-8-16
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?

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回答（2 个）

Azzi Abdelmalek
Azzi Abdelmalek 2016-8-16
编辑：Azzi Abdelmalek 2016-8-16
reshape(A(:),16,[])'
KSSV
KSSV 2016-8-16
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

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