converting 2d matrix to 3d

Can anyone help me with making a 2D matrix into a 3D matrix?

I have a (71680 x 8) 2d matrix and I need to make a 3D matrix of dimensions (512 x 8 x 140) I need to take (512 x 8) consecutive matrices by row for 140 layers.

Can anyone help me with this? I really appreciate any help

Answer 1

[Titus Edelhofer]

HI Joe,

if I'm not mistaken, it should be

permute(reshape(X, 512, 140, 8), [1 3 2]);

Titus

[Joe M]

yes it works! thanks

[Titus Edelhofer]

Hi Joe,

thanks. Could you please accept the answer then so others know it's already answered?

Titus

[Christopher Ndehedehe]

Answer is great. it helped as well. Thanks Joe

Answer 2

[amit]

permute(reshape(X, 512, 140, 8), [1 3 2]); what is [1 3 2] stands for?

[Walter Roberson]

https://www.mathworks.com/help/matlab/ref/permute.html

"B = permute(A,order) rearranges the dimensions of A so that they are in the order specified by the vector order"

In your case it would rearrange reshape(X, 512, 140, 8) to be 512 x 8 x 140 by rearranging the elements. What was previously indexed at location (I,J,K) would be at location (I,K,J) in the new array.