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rust-ndarray
ndarray: an N-dimensional array with array views, multidimensional slicing, and efficient operations
In principle you're trying to convert between columnar and row-based data layouts, something that happens fairly often in data science. I bet there's some hyper-efficient SIMD magic that could be invoked for these slicing operations (and maybe the iterator solution does exactly that). Might be worth taking a look at how the relevant Rust libraries like ndarray do it.
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I have published the source code and a more detailed writeup on Github.
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