[R] summarizing "alternative to rep"

Bill Shipley Bill.Shipley at Usherbrooke.ca
Thu Nov 14 17:32:13 CET 2002

Yesterday I asked how to "expand" a vector similar to the rep() function 
but keeping the original order.  For instance, given a vector:
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: 

Thanks to all who helped.

Bill Shipley
Departement de biologie
Universite de Sherbrooke
Sherbrooke (Quebec) CANADA J1K 2R9
Bill.Shipley at USherbrooke.ca

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