On Nov 1, 2012, at 6:38 PM, arun wrote: > Hi, > > You can try this also : > set.seed(132) > > dat1<-data.frame(Company=rep(LETTERS[1:4],c(3,4,5,6)),Last_year=sample(2005:2012,18,replace=TRUE)) > dat2<-dat1[order(dat1$Company,dat1$Last_year),] > dat2$Last<-ave(dat2$Last_year,dat2$Company,FUN=function(x) > ifelse(x>=2009,2009,x))
None of the `ifelse` conditional or desired consequent depend on the Company value. Just wasted CPU cycles are the result. If you choose to use `ifelse` , then why not: dat2$Last2<- ifelse(dat2$Last_year > 2009, 2009, dat2$Last_year) # the '=' also not needed head(dat2) > > # Company Last_year Last > #3 A 2007 2007 > #1 A 2010 2009 > #2 A 2012 2009 > #6 B 2007 2007 > #4 B 2008 2008 > #5 B 2008 2008 > > identical(dat2[,3],pmin(dat2[,2],2009)) > #[1] TRUE > > identical(dat2[,4],pmin(dat2[,2],2009)) [1] TRUE > A.K. > > > > ----- Original Message ----- > From: kebrab67 <selamgetac...@gmail.com> > To: r-help@r-project.org > Cc: > Sent: Thursday, November 1, 2012 8:41 PM > Subject: [R] If loops? > > I have a set of data with 205 988 observation sand 10 variables , three of > which are Legal_status, Date_of_incorporation and Last_year. I set my time > horizon from 1989 to 2009. Now I want to know when a company is dead. If > Last_year is bigger or equal to 2009 then I say that a new "variable" last > is 2009. If Last_year is smaller than 2009 then my new variable "last" is > equal to the variable "Last_year". I wanted to know how I can generate this > new variable and connect it to my original data called data. > > > > -- > View this message in context: > http://r.789695.n4.nabble.com/If-loops-tp4648199.html > Sent from the R help mailing list archive at Nabble.com. > [[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. > David Winsemius, MD Alameda, CA, USA ______________________________________________ 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.
