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2004 Apr 08
1
Why are Split and Tapply so slow with named vectors, why is a for loop faster than mapply
...subsequent computations. What I've found, however, is that it is not easy (or I have not found the easy way) to split a named vector into a list that retains the vector names. For example, splitting an unnamed vector (70,000+) based on the chain numbers takes very little time: > system.time(actTimeList <- split(actTime, chainId)) [1] 0.16 0.00 0.15 NA NA But if the vector is named, R will work for minutes and still not complete the job: > names(actTime) <- zoneNames > system.time(actTimeList <- split(actTime, chainId)) Timing stopped at: 83.22 0.12 84.49 NA NA The same th...