[R] "Simplifying" matrices ?

[arun]

Hi,

It is better to provide an example dataset.

Try this:
# example on data.frame
dat1<-data.frame(year=rep(c(1998,1999,2000),each=3),event=rep(LETTERS[1:3],times=3),team=rep(1:3,each=3),total=rep(c(300,320,140),each=3))
library(plyr)
res<-ddply(dat1,.(year,team),function(x) colMeans(x[4]))
 res
#  year team total
#1 1998    1   300
#2 1999    2   320
#3 2000    3   140
 with(dat1,aggregate(total,by=list(year=year,team=team),mean))
#  year team   x
#1 1998    1 300
#2 1999    2 320
#3 2000    3 140
A.K.

----- Original Message -----
From: rajashekar <rajashekarpanneti at yahoo.in>
To: r-help at r-project.org
Cc: 
Sent: Thursday, December 6, 2012 8:45 AM
Subject: [R] "Simplifying" matrices ?

Hi again, 

the previous answers were great. I was able to do what was planned. 
Now, I would like to do the following to a matrix: 

|| year | event | team | total || 

where I can have multiple "event" per "team", but each "team" only has 
a "year" and a "total". Thus, this table has multiple lines for the 
same "team" where only the "event" changes. 
Considering this, how can I output this: 

|| year | team | total || 

where each "team" occurs only once, and the "event" was discarded. 

Hope I made myself clear. 
Thanks in advance. 




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