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compute only diagonals of matrix multiplication in R

I need only the diagonal elements from a matrix multiplication: , in R. As Z is huge I want to avoid the ... a function available to do this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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compute all pairwise differences within a vector in R

There are several posts on computing pairwise differences among vectors, but I cannot find how to compute all differences ... that can do this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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