> -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Walter Alini > Sent: Tuesday, October 23, 2007 1:18 PM > To: r-help@r-project.org > Subject: [R] Replace values on seq > > Hey guys, sorry for the inconvenience (this might be a hundred times > answered question), but I have been searching a while and gave up > about the following: > > I have the following, table and data: > > table <- seq(255, 0, by=-1) > data <- c(1,8,...) <--- doesn't matter what's in here > > Which would be the most efficient way to replace each data value, v_i, > by table[v_i + 1] ? > And, maybe more important, why is that more efficient? > > I used this, but I think is not the best option: > > for (i in 1:length(data)){ > data[i] <- table[data[i]+1] > } > > Then used mapply, that seems to work better: > > f<-function(x){ > 255-x > } > > mapply(f, data) > > Thanks guys in advance, > Walter
How about something like data<-table[data+1] Hope this is helpful, Dan Daniel J. Nordlund Research and Data Analysis Washington State Department of Social and Health Services Olympia, WA 98504-5204 ______________________________________________ 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.