converting 2d matrix to 3d

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Joe M
Joe M 2014-6-25
评论： Walter Roberson 2016-10-4
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

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采纳的回答

Titus Edelhofer
Titus Edelhofer 2014-6-25
HI Joe,
if I'm not mistaken, it should be
permute(reshape(X, 512, 140, 8), [1 3 2]);
Titus
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Titus Edelhofer
Titus Edelhofer 2014-6-25
Hi Joe,
thanks. Could you please accept the answer then so others know it's already answered?
Titus
Christopher Ndehedehe
Christopher Ndehedehe 2014-9-2
Answer is great. it helped as well. Thanks Joe

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更多回答（1 个）

amit
amit 2016-10-3
permute(reshape(X, 512, 140, 8), [1 3 2]); what is [1 3 2] stands for?
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Walter Roberson
Walter Roberson 2016-10-4
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.

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