Λεωνίδας Μπαντής wrote: > > 1. Suppose I have a<-c(1:10) (or a<-array(c(1:10),dim=c(1,10))) > > and I want to end up with vector b=[0 0 0 0 0 1 1 1 1 1]. i.e. I want to > substitute alla elements that are <5 with 0 and >5 with 1. >
I think you mean >=5, not > 5. In that case, try this: b <- ifelse( a < 5, 0, 1) Λεωνίδας Μπαντής wrote: > > 2. Suppose I have a<-c(1,1,2,2,3,3) (or array again) > > And I want to place a "4,5" before every "2" and end up with a new > "bigger" vector "b": > > b=[1 1 4 5 2 4 5 2 3 3] > > Also I want to find where the 2's in array "a" (if it was an array) are > located i.e. positions 3,4. > Not sure how to insert the 4,5, but this will find the where the 2's are: which(a == 2) -- View this message in context: http://www.nabble.com/array-manipulation-simple-questions-tp22173710p22175864.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.
