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acttime
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 t...