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Sep 16, 2023 at 9:45 comment added Maarten Havinga Thanks from me as well, I always search for "Hadamard" which due to your answer made me find this question. The question in turn gave me new mathematical ideas :)
Sep 13, 2023 at 12:26 comment added ACR Thanks for the response, but this is not my main query. It is the same answer which you had mentioned earlier in the deleted post. The question is about not about S matrices or their constructions into a circulant. The question is related to reshaping the raw data into a matrix in such a way that its multiplication becomes compatible with matrix S. I wanted to know what was the mathematical logic behind that re-arranging the data in such a way? Thanks.
Sep 13, 2023 at 12:04 history answered kodlu CC BY-SA 4.0