Mike, Try
growth[sample(1:length(growth)),] to permute the rows. Jonathan On Tue, Sep 28, 2010 at 8:38 PM, Michael Larkin <mlar...@rsmas.miami.edu>wrote: > Thanks to the people on this list I was able to fix my code for randomly > sampling. Thanks. > > > > Now, I am moving on to the next step and I ran into another snag. I have a > large dataset but I am starting with a small made-up dataset until I figure > it out. I have two columns of data (age and length). I got R to read my > data called growth which is the age and length for 10 fish: > > > > > growth > > Age Length > > 1 2 200 > > 2 5 450 > > 3 6 600 > > 4 7 702 > > 5 8 798 > > 6 5 453 > > 7 4 399 > > 8 1 120 > > 9 2 202 > > > > Then I believe I converted my data to a three vectors by: > > > > newgrowth<-c(growth) > > > > Now I want to randomly select the values from this dataset to create a new > dataset. I want to do this many times, however, for now I am just trying > to > get it to randomly select from the dataset only once. The trick is that I > need to keep the columns together. Each age corresponds to a length. For > example, the 200 length fish has an age of 2 years. > > > > I tried to resample the data with this code: > > > > sample(newgrowth) > > > > However, I ended up getting the data listed as a row in the same order, not > randomly selected. I pasted the result below. > > > > > sample(newgrowth) > > $Age > > [1] 2 5 6 7 8 5 4 1 2 > > > > $Length > > [1] 200 450 600 702 798 453 399 120 202 > > > > Any advice on how I can randomly select from these 9 rows of data would be > greatly appreciated. > > > > Mike > > > [[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. > [[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.
