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                                            Neal Yu

Exercise 19.3 Q2 Different Conclusion

Try to replicate the performance comparison between `apply(x, 1, sum)` and `rowSums(x)`. It seems that the result I got indicates the running time gain is independent of the size of...

19.5.3 Rolling joins

Chapter 19.5.3 Rolling joins, figure 19.16, if the join condition is specified as `join_by(closest(key