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Hi David, You bring up a good question. I am not sure what is the "right" way to solve it. But here is a simple solution I put together: x = c(1:10,5) y = x x[c(2,3)] <- NA # reproducing the problem: y[x==5] na2F <- function(x) { x2 <- x x2[is.na(x)] <- F x2 } na2F(x==5) # "solved" y[na2F(x==5)] I'd be happy to see other solutions to it. With regards, Tal ----------------Contact Details:------------------------------------------------------- Contact me: Tal.Galili@gmail.com | 972-52-7275845 Read me: www.talgalili.com (Hebrew) | www.biostatistics.co.il (Hebrew) | www.r-statistics.com (English) ---------------------------------------------------------------------------------------------- On Thu, Apr 12, 2012 at 12:08 PM, David Studer <studerov@gmail.com> wrote:> Hello everybody, > > I know this is pretty basic stuff, but could anyone explain me how to > recode a single value of a variable > into a missing value? > > I used to do it like this: > > myData[myData$var1==5;"var1"]<-NA # recode value "5" into "NA" > > But the column "var1" already contains NAs, which > results in the following error message: > > "missing values are not allowed in subscripted assignments of data frames" > > Thank you very much for any advice! > > David > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. >[[alternative HTML version deleted]]
Le jeudi 12 avril 2012 ? 11:08 +0200, David Studer a ?crit :> Hello everybody, > > I know this is pretty basic stuff, but could anyone explain me how to > recode a single value of a variable > into a missing value? > > I used to do it like this: > > myData[myData$var1==5;"var1"]<-NA # recode value "5" into "NA" > > But the column "var1" already contains NAs, which > results in the following error message: > > "missing values are not allowed in subscripted assignments of data frames" > > Thank you very much for any advice!You can just do this: myData <- data.frame(var1=1:10) myData$var1[2]<-NA myData[myData$var1 == 5, "var1"] <- NA # Fails myData$var1[myData$var1 == 5] <- NA # Works myData var1 1 1 2 NA 3 3 4 4 5 NA 6 6 7 7 8 8 9 9 10 10 Regards
1. Some data structured the way you are using would have been helpful. I used Tal Galil's play data and set up a dataframe with the variable names you are using: structure(list(var1 = c(1, NA, NA, 4, 5, 6, 7, 8, 9, 10, 5), var2 = c(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 5)), .Names = c("var1", "var2"), row.names = c(NA, -11L), class = "data.frame")> myDatavar1 var2 1 1 1 2 NA 2 3 NA 3 4 4 4 5 5 5 6 6 6 7 7 7 8 8 8 9 9 9 10 10 10 11 5 5 2. The error message I get from your line of code is> myData[myData$var1==5;"var1"]<-NAError: unexpected ';' in "myData[myData$var1==5;" Probably the semikolon is a typo? 3. If I understand your question correctly, the easiest answer I can find is ifelse():> myData$var1 <- ifelse( myData$var1 == 5, NA, myData$var1 ) > myDatavar1 var2 1 1 1 2 NA 2 3 NA 3 4 4 4 5 NA 5 6 6 6 7 7 7 8 8 8 9 9 9 10 10 10 11 NA 5 Rgds, Rainer On Thursday 12 April 2012 11:08:45 David Studer wrote:> Hello everybody, > > I know this is pretty basic stuff, but could anyone explain me how to > recode a single value of a variable > into a missing value? > > I used to do it like this: > > myData[myData$var1==5;"var1"]<-NA # recode value "5" into "NA" > > But the column "var1" already contains NAs, which > results in the following error message: > > "missing values are not allowed in subscripted assignments of data frames" > > Thank you very much for any advice! > > David > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help at r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code.
> myData[myData$var1==5;"var1"]<-NA # recode value "5" into "NA"try myData[!is.na(myData$var1) & myData$var1==5;"var1"]<-NA or, more simply, myData$var1[myData$var1==5]<-NA ******************************************************************* This email and any attachments are confidential. Any use...{{dropped:8}}