[Rd] NA and NaN in function identical

From: Petr Savicky <savicky_at_cs.cas.cz>
Date: Wed, 29 Aug 2007 15:53:27 +0200

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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