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hashfn
2007 Nov 02
0
applying duplicated, unique and match to lists?
...cases (break even seems to be for quite small list elements like 2 doubles).
1) the new versions should also work for lists with a dim attribute (old versions has as.vector() which does not work for lists)
Factor 10 speedup for row duplicates (here atomic matrices)
> system.time(duplicated(x, hashFUN=function(x)paste(x, collapse="\r")))
user system elapsed
2.37 0.02 2.45
> system.time(duplicated(x, hashFUN=md5))
user system elapsed
0.51 0.00 0.51
> system.time(duplicated(x, hashFUN=list))
user system elapsed
0.17 0.00 0.17
2) Spee...