Re: [R] question on aggregate

2011-01-10 Thread Gabor Grothendieck
On Mon, Jan 10, 2011 at 8:23 PM, analys...@hotmail.com wrote: > an example available on the net goes like > >> df >  identifier quantity > 1          1       10 > 2          1       20 > 3          2       30 > 4          1       15 > 5          2       10 > 6          3       20 >> aggregate(df$q

[R] question on aggregate

2011-01-10 Thread analys...@hotmail.com
an example available on the net goes like > df identifier quantity 1 1 10 2 1 20 3 2 30 4 1 15 5 2 10 6 3 20 > aggregate(df$quantity, by=list(df$identifier), sum) Group.1 x 1 1 45 2 2 40 3

Re: [R] question on aggregate

2009-05-01 Thread milton ruser
Mark, Give a look: rres<-read.table(stdin(), head=T, sep=",") ID,Traversed, v2 1,5,1 1,7,1 1,8,1 2,8,2 2,11,2 2,7,2 3,11,3 3,22,3 3,16,3 aggregate(rres[c("Traversed", "v2")], list(rres$ID), sum) bests milton On Fri, May 1, 2009 at 5:07 PM, Altaweel, Mark R. wrote: > Hi, > > I am trying to

[R] question on aggregate

2009-05-01 Thread Altaweel, Mark R.
Hi, I am trying to sum column information in a list with 3 instances. For example: ID Traversed IDTraversed IDTraversed 1 5 1 71 8 2 8 2 11 2 7 3