Hello, Sam Albers wrote:
Hello there,I have a situation where I would like to select the first row of a particular factor for a data frame (data example below). So that is, I would like to select the first entry when the factor1 =A and then the first row when factor1=B etc. I have thousands of entries so I need some general way of doing this. I have a minimal example that should illustrate what I am trying to do. I am using R version 2.9.2, ESS version 5.4 and Ubuntu 9.04. Thanks so much in advance! Sam #Minimal example x <- rnorm(100) y <- rnorm(100) xy <- data.frame(x,y) xy$factor1 <- c("A", "B","C","D") xy$factor2 <- c("a","b") xy <- xy[order(xy$factor1),] #This simply orders the data to look more like the actual data I am working with
Does xy[!duplicated(xy$factor1),] do what you want? ______________________________________________ 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.
