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ascii
2011 Jan 21
1
match function causing bad performance when using table function on factors with multibyte characters on Windows
...Windows. Here?s a simple
example with benchmark results (I?ve reduced the number of replications to
make the function finish within reasonable time):
library(rbenchmark)
x.num=sample(1:2, 10^5, replace=TRUE)
x.fac.ascii=factor(x.num, levels=1:2, labels=c("A","B"))
x.fac.nascii=factor(x.num, levels=1:2, labels=c("?","?"))
benchmark( table(x.num), table(x.fac.ascii), table(x.fac.nascii), table(unclass(x.fac.nascii)), replications=20 )
test replications elapsed relative user.self sys.self user.child sys.child
4 table(...