Tom wrote: > On Tue, 10 Jan 2006 20:25:23 -0500, r user <[EMAIL PROTECTED]> wrote: > > >>I have 2 dataframes, each with 5 columns and 20 rows. >>They are called data1 and data2.I wish to create a >>third dataframe called data3, also with 5 columns and >>20 rows. >> >>I want data3 to contains the values in data1 when the >>value in data1 is not NA. Otherwise it should contain >>the values in data2. >> >>I have tried afew methids, but they do not seem to >>work as intended.: >> >>data3<-ifelse(is.na(data1)=F,data1,data2) >> >>and >> >>data3[,]<-ifelse(is.na(data1[,])=F,data1[,],data2[,]) >> >>Please suggest the “best” way.
"Better" way is to have the Syntax correct: data3 <- ifelse(is.na(data1), data2, data1) Please check the archives for almost millions of posts asking more or less this question...! > Not sure about the bast but... > > a<-c(1,2,3,NA,5) > b<-c(4,4,4,4,4) > > c<-a > c[which(is.na(a))]<-b[which(is.na(a))] Why do you want to know which()? na <- is.na(a) c[na] <- b[na] Uwe Ligges > > > > >>______________________________________________ >>R-help@stat.math.ethz.ch mailing list >>https://stat.ethz.ch/mailman/listinfo/r-help >>PLEASE do read the posting guide! >>http://www.R-project.org/posting-guide.html >> > > > ______________________________________________ > R-help@stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
