Hi May I ask you why do you need such operation. I cannot imagine a situation where I would need to do this. The only imaginable procedure is to merge NA enhanced object with another object but for that situation usually
?merge is used Cheers Petr > -----Original Message----- > From: R-help [mailto:r-help-boun...@r-project.org] On Behalf Of Curtis > Burkhalter > Sent: Thursday, March 05, 2015 9:42 PM > To: r-help@r-project.org > Subject: [R] problem with function that adds rows to dataframe based on > conditional statement > > Hello everyone, > > I'm having a problem with a function that I wrote that is supposed to > add a > row to dataframe based upon a conditional statement. To explain I've > used > an example below: > > #create data frame > animals=c("bird","dog","cat") > animals=rep(animals,each=4) > animals=animals[1:11] > animalYears=c(1,1,2,2,1,1,2,2,1,1,2) > animalMass=round(runif(11,min=10,max=50),0) > > comAn=as.data.frame(cbind(animals,animalYears,animalMass)) > comAn > > * animals* *animalYears* *animalMass* > 1 bird 1 30 > 2 bird 1 32 > 3 bird 2 27 > 4 bird 2 16 > 5 dog 1 22 > 6 dog 1 25 > 7 dog 2 41 > 8 dog 2 22 > 9 cat 1 30 > 10 cat 1 37 > 11 cat 2 49 > > We can see here that for every type of animal I have two years of mass > measurements, except for the cat in year 2. What I want to do is add an > additional row to the end of the dataframe that consists strictly of > NAs > and then I can substitute those out later. > > So what I first did was split the 'comAn' dataframe into the different > Animal by Year combos. > > #This line splits 'com_An' into a list ordered by the Animal by Year > combos > comAn_split=split(comAn, paste(comAn$animals,comAn$animalYear)) > > Then I wrote the function that identifies whether a particular Animal > by > Year combo is less than two rows in length and if so it should add > another > row that consists only of NAs using the vector 'NAs': > > #This function identifies the length of each Animal by Year combo and > then > #uses the rbind function built in R to add a row > #to each animal by year combo if they have less than 2 samples > > addNA <- function(comAn) { > NAs=c(NA,NA,NA) > ind <- seq_len(nrow(comAn)) > comAn[ifelse(length(ind)<2,rbind(NAs),length(ind)),] > } > > #This applies the function addNs to the animals data organized in list > format > addedNAcomAn <- do.call(rbind, lapply(comAn_split, addNA)) > addedNAcomAn > > When I apply the function to the list of the different Animal by Year > combos this is what I get: > animals animalYears animalMass > bird 1 bird 1 23 > bird 2 bird 2 50 > cat 1 cat 1 15 > cat 2 <NA> <NA> <NA> > dog 1 dog 1 23 > dog 2 dog 2 38 > > What I expect is this: > > animals animalYears animalMass > 1 bird 1 41 > 2 bird 1 23 > 3 bird 2 23 > 4 bird 2 50 > 5 dog 1 49 > 6 dog 1 23 > 7 dog 2 13 > 8 dog 2 38 > 9 cat 1 42 > 10 cat 1 15 > 11 cat 2 33 > 12 NA NA NA > > Am I conditioning improperly within the function or am I missing > something > else. Any help would be greatly appreciated. > > Best > > -- > Curtis Burkhalter > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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. ________________________________ Tento e-mail a jakékoliv k němu připojené dokumenty jsou důvěrné a jsou určeny pouze jeho adresátům. Jestliže jste obdržel(a) tento e-mail omylem, informujte laskavě neprodleně jeho odesílatele. Obsah tohoto emailu i s přílohami a jeho kopie vymažte ze svého systému. Nejste-li zamýšleným adresátem tohoto emailu, nejste oprávněni tento email jakkoliv užívat, rozšiřovat, kopírovat či zveřejňovat. Odesílatel e-mailu neodpovídá za eventuální škodu způsobenou modifikacemi či zpožděním přenosu e-mailu. 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