MATLAB: How to use Permute

permute

Hello,

I have a matrix A(2362×48) and I want to convert this into a 3D matrix B(2362X12X4). So I want all the rows of columns 1:12 of matrix A to be in B(:,:,1) and all rows of columns 13:24 of A in B(:,:,2) etc. Can anyone help me with this? I tried permute but get different matrices all the time..

Best Answer

reshape(A,size(A,1),12,4)

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MATLAB: Creating mxn matrix from mxnxp matrix [without jumbling elements]

A = repmat(magic(5),[1 1 6]); %easy to verify
A = reshape(permute(A,[2 1 3]),size(A,1),[])'; %permute, pull columnwise to 2d, transpose to undo permute

MATLAB: Permute in GPU

RESHAPE is very efficient, because it does not touch the data, but only the vector of dimensions. Therefore the computational costs of your procedure are optimal already, if the TRANSPOSE is programmed efficiently. A PERMUTE cannot be faster.

I'd expect, that süpecifying the dimension to operate on is helpful here: "fft(X,[],dim)". But I don't know, if this works with the GPU toolbox.

Best Answer

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MATLAB: Creating mxn matrix from mxnxp matrix [without jumbling elements]

MATLAB: Permute in GPU

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