The help page for function identical says:
'identical' sees 'NaN' as different from 'as.double(NA)', but all
'NaN's are equal (and all 'NA' of the same type are equal).
However, we have
x <- NaN
y <- as.double(NA)
x # [1] NaN
y # [1] NA
identical(x,y) # [1] TRUE
In my opinion, NaN and as.double(NA) should be distinguished as the
help page suggests.
Tested under R version 2.5.1 Patched (2007-08-19 r42638) on Linux (CPU Xeon).
Petr Savicky.
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