Dear list members: I am looking for an elegant (or efficient) way to accomplish the following:
take a large boolean vector and fill the TRUE values with the values from a smaller boolean vector that has a length that is the number of TRUE values of the large vector. Example: large<- c(FALSE, FALSE, FALSE, TRUE, FALSE, FALSE, TRUE, FALSE, FALSE, FALSE, TRUE, FALSE) small<- c(TRUE, FALSE, TRUE) desired output = c(FALSE, FALSE, FALSE, *TRUE*, FALSE, FALSE, *FALSE*, FALSE, FALSE, FALSE, *TRUE*, FALSE) (without the asterisks! ) my first thought as someone new to R was ifelse(large,small, large) but that returns: c(FALSE FALSE FALSE TRUE FALSE FALSE TRUE FALSE FALSE FALSE FALSE FALSE) because small is cycled to match the size of large instead of the size of the TRUE subset of large. I am guessing that there is probably a way to do this without writing a loop, but I just don't know the syntax. -mph ______________________________________________ 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.
