How do I convert that position to the element index?

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I have a 3x3x3 matrix (MP) of normalized probabilities (sum up to 1). When I run sample(27,1, MP, replace = T), it returns an integer between 1 and 27, presumably the sequential index of the matrix. I would like to know which matrix element in terms of element indexes (eg row number, column number, z number). When building an array of N dimensions (in this case N=3), how does one determine the order of the elements? In other words, if I took an N dimensional array and put all the elements in a list, how can I map the list to the N dimensional elements?

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关键词：position Element Convert Index That