[R] summarizing "alternative to rep"

[Bill Shipley]

Yesterday I asked how to "expand" a vector similar to the rep() function 
but keeping the original order.  For instance, given a vector:
x<-c(3,2,5)
I was looking for some function - call it expand() - such that :
expand(x,3) would return 3,3,3,2,2,2,5,5,5

I received many replies and, as usual in R, there are many different ways 
of doing this.

1. Brian D. Ripley said: rep(x, each=) was something from S4 I added to R 
for 1.5.0 so it has  only been there for 6 months or so.  This is the 
simplest way but I had an older version of R...

2.  rep(c(2,5,4),rep(3,3))  (or more generally: y<-rep(x,rep(length(x),3)) 
) which also works.

3. I found that this works as well: 
as.vector(apply(as.matrix(y),1,function(x){rep(x,n.times)}))

Thanks to all who helped.


Bill Shipley
Departement de biologie
Universite de Sherbrooke
Sherbrooke (Quebec) CANADA J1K 2R9
Bill.Shipley at USherbrooke.ca
http://callisto.si.usherb.ca:8080/bshipley/

-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !)  To: r-help-request at stat.math.ethz.ch
_._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._