MATLAB: Transposing 3 D matrix using permute – how does permute work

3d matrixmatrix traspose

Ok. So I see how to transpose all the "2D slices" of a 3D matrix on other answers (permute(A, [2 1 3])).

But what does the order vector mean? The 2 means what? The second row, column? Anyone who can explain this, I appreciate it.

Thanks

Best Answer

It is the dimension number. In [2 1 3] it means that the second dimension of the original should become the first dimension of the new array, and the first dimension of the original should become the second dimension of the new array, and the third dimension of the original should stay where it is.

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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.

MATLAB: How to insert values from the vertical 3rd matrix dimension in between the rows of the vertical 1st and 2nd dimension

reshape(permute(Mtx,[2 3 1]),2,[])'

Best Answer

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MATLAB: Permute in GPU

MATLAB: How to insert values from the vertical 3rd matrix dimension in between the rows of the vertical 1st and 2nd dimension

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