Hello, duplicated() does not seem to work for a long vector. For example, if you download the data from https://docs.google.com/open?id=0B6-m45Jvl3ZmNmpaSlJWMXo5bmc (a vector with about 12,000 numbers) and then run the following code which does duplicated() over the whole vector but just shows the last 30 elements:
data.frame( tail(verylong, 30), tail(duplicated(verylong), 30) ) you'll see that at the end of the very long vector everything is listed as a duplicate of the preceding element (even though it shouldn't be). On the other hand, if you run the following code which just takes out the last 30 elements of the vector and does duplicated on them: data.frame( tail(verylong, 30), duplicated(tail(verylong, 30)) ) you get the correct results (FALSE shows up wherever the value in the first column changes). Does anyone know why this happens, and if there's a fix? I notice the documentation for duplicated() says: "Long vectors are supported for the default method of duplicated, but may only be usable if nmax is supplied." But I've tried running this with a high value of nmax given, and it still gives me the same problem. So far the only way I've figured out to get this duplicated()-like vector is to use a for loop going through one item at a time, but that takes about a minute to run. Best, Steve Politzer-Ahles -- Stephen Politzer-Ahles University of Kansas Linguistics Department http://people.ku.edu/~sjpa/ ______________________________________________ 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.
