oehl_list@gmx.de
2002-May-17 12:59 UTC
[Rd] type.convert() does not treat "NA" as ordinary string as intended from version 1.5 (PR#1567)
# replication code at end of mail> # As from R 1.5 > > identical(as.character(NA), "NA")[1] FALSE> > # there is no longer a fundamental difference between "NA" > # and an ordinary string like "NN" (WHICH IS A GREAT IDEA!!) > # however, though "NA" is not given as na.strings we have > > type.convert(c("NA", "1", NA), na.strings="b")[1] NA 1 NA> # compare to > type.convert(c("NN", "1", NA), na.strings="b")[1] NN 1 <NA> Levels: 1 NN NA> > # dito > type.convert(c("NA", "1", NA), na.strings=character())[1] NA 1 NA> # compare to > type.convert(c("NN", "1", NA), na.strings=character())[1] NN 1 <NA> Levels: 1 NN NA # furthermore, may be type.convert should have default # function(x, na.strings = NA, as.is = FALSE, dec = ".") # or # function(x, na.strings = character(), as.is = FALSE, dec = ".") # or # function(x, na.strings = NULL, as.is = FALSE, dec = ".") # rather then # function(x, na.strings = "NA", as.is = FALSE, dec = ".") # As from R 1.5 identical(as.character(NA), "NA") # there is no longer a fundamental difference between "NA" # and an ordinary string like "NN" (WHICH IS A GREAT IDEA!!) # however, though "NA" is not given as na.strings we have type.convert(c("NA", "1", NA), na.strings="b") # compare to type.convert(c("NN", "1", NA), na.strings="b") # dito type.convert(c("NA", "1", NA), na.strings=character()) # compare to type.convert(c("NN", "1", NA), na.strings=character()) -- -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-devel mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-devel-request@stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._