Barry Rowlingson <[EMAIL PROTECTED]> writes: > michael watson (IAH-C) wrote: > > There must be a million ways of doing this! > > Actually I'd say there were no ways of doing this, since I dont > think you can actually insert into a vector - you have to create a new > vector that produces the illusion of insertion! > > Here's a Q+D function that fails if you try and insert at the start, > or at the end. Its very D. > > insert <- function(v,e,pos){ > return(c(v[1:(pos-1)],e,v[(pos):length(v)])) > }
This is actually an exercise in a certain introductory book on R, with the intention of having the student do the obvious c(v[1:4],5,v[5:5]) style computation and maybe think a little about the edge effects. I only recently saw the somewhat unfortunately named append() function, which has been in S/R ever since the blue book...: > append(v,5,4) [1] 1 2 3 4 5 6 -- O__ ---- Peter Dalgaard Blegdamsvej 3 c/ /'_ --- Dept. of Biostatistics 2200 Cph. N (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907 ______________________________________________ [EMAIL PROTECTED] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html