Hi [EMAIL PROTECTED] napsal dne 21.02.2008 22:57:31:
> > useR's, > > I want to apply this function to the columns of a data frame: > > u[u >= range(v)[1] & u <= range(v)[2]] Do you really mean this function? range(v) gives you an overall range in data frame v e.g. (1,5) and u[your ranges] gives you a vector of all values in u which lie inside the overall range. If you want to select in each u column values within range of appropriate v column and if your data frames are not really huge and have reasonable number of columns I would use for cycle. for( i in 1:dim(u)[2]) z[[i]]<-u[u[,i] >= range(v[,i])[1] & u[,i] <= range(v[,i])[2], i] Regards Petr > > where u is the n column data frame under consideration and v is a data frame > of values with the same number of columns as u. For example, > v1 <- c(1,2,3) > v2 <- c(3,4,5) > v3 <- c(2,3,4) > v <- as.data.frame(cbind(v1,v2,v3)) > > uk1 <- seq(min(v1) - .5, max(v1) + .5, .5) > uk2 <- seq(min(v2) - .5, max(v2) + .5, .5) > uk3 <- seq(min(v3) - .5, max(v3) + .5, .5) > > u <- do.call("expand.grid", list(uk1,uk2,uk3)) > > Here, there are 3 columns; instead of hard-coding this, can the function > given above, which will restrict the u data frame to values within the > ranges of each variable, be done with the apply function? Thanks in > advance. > > dxc13 > > -- > View this message in context: http://www.nabble.com/applying-a-function-to- > data-frame-columns-tp15619657p15619657.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > 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. ______________________________________________ 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.