The following seems close to the form you were trying. It works for matrices, not dataframes. You can use as.matrix and as.data.frame to convert back and forth:
# test data data1 <- data2 <- matrix(1:6,3) data1[2,2] <- NA data1[] <- ifelse(is.na(data1), data2, data1) On 1/11/06, t c <[EMAIL PROTECTED]> wrote: > Uwe, > FYI: > > I tried: "data3 <- ifelse(is.na(data1), data2, data1)" > > It seems to me that data3 is an array of length 100. > > I do NOT end up with a dataset of 5 columns and 20 rows. > > Uwe Ligges <[EMAIL PROTECTED]> wrote: > Tom wrote: > > On Tue, 10 Jan 2006 20:25:23 -0500, r user 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 > > > > --------------------------------- > > Photo Books. You design it and we'll bind it! > [[alternative HTML version deleted]] > > > > ______________________________________________ > 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
