Reshaping Array

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#47 opened on Jun 27, 2019 19 comments 0 reactions 1 assignee View on GitHub

@hpages is already working on this.

Since Jul 9, 2019.

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Description

First, thanks for the package. It's exactly what we needed. We're working on neuroimaging data: https://github.com/muschellij2/niftiArray. We're trying to do statistics over multiple 3D arrays. I believe this doesn't fit well with DelayedMatrixStats as matrixStats requires 2D matrices.

Similar to https://github.com/Bioconductor/DelayedArray/issues/30 and the comment here https://github.com/Bioconductor/DelayedArray/issues/30#issuecomment-423683637, I was wondering about "reshaping" an array. Really, I want to be able to vectorize a DelayedArray or convert a 4D DelayedArray to a 2D matrix where the first 3 dimensions are the rows of the matrix and the 4th dimension is the columns. I can realize the array, convert to a matrix, and then create a DelayedArray or DelayedMatrix for the current solution.

Ideally, I'd be able to do this without realizing the array into memory. I'm not sure if HDF5 (the backend we're using) would support this, but we would it useful. Trying to set dim or change the dimensions fails due the (correct) checks on DelayedMatrix. Just wondering if it were possible, if it makes sense with HDF5, and if both are true, then would it be possible to implement? I can send a reprex if necessary, but the setting of dimensions is well documented.

Dominant language: R
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