How to pass a 3d array double[][][] from java to a Matlab function

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Felipe Reis 2018-8-17

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评论： James Tursa 2018-8-23

I have a matlab function inside a jar package which is supposed to receive from my java class a double[][][]. Due the difference in the way java and matlab understand array structures when the array arrives to the matlab side it is messed.

Is there a way to convert java 3d array so then each dimension can be read like: (:,:,1) (:,:,2) and (:,:,3) in the matlab function?

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Answer 1

James Tursa 2018-8-17

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As long as it arrives as a 3D variable but the dimensions seem backwards, perhaps you only need to permute it. E.g.,

x = 3D array from your java
x = permute(x,[3 2 1]); % permute to MATLAB memory ordering

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Felipe Reis 2018-8-21

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@James thanks for your answer. It was the right start to achieve what I wanted. In my case I had to work it out like this: DS is my java double[][][] and from matlab i would like to access each chunk of data like

DS(:,:,indexchunkofdata)

and have a NxM matrix as result so i did:

PDS = permute(DS,[3 2 1])
ChunkOfData = PDS(:,:,indexChunkOfData)
ChunkOfData = ChunkOfData'

So it's kind of the last dimension after the permutation still needed some transpose to invert what was column into lines and vice-versa. Also a side comment is that after the permute new zeros columns where added to the last dimension!? Still don't know the reason. Any insight?

Thanks again