R users,
This probably involves a simple incantation of one of the flavors of apply...
that I can't yet figure out. Consider a list of data frames. I'd like to apply
a function (mean) across the list and return a dataframe of the same dimensions
where each cell represents the mean of that cell across all dataframes.
# set up the list
x <- vector("list",2)
names(x) <- c("one","two")
# add data to the list
for(i in 1:2){
y = i^2
x[[i]] <-
data.frame("a"=c(y,2*y,3*y),"b"=c(y+1,y+2,y+3),"c"=c(2*y+1,2*y+2,2*y+3))
}
#show the list
> x
$one
a b c
1 1 2 3
2 2 3 4
3 3 4 5
$two
a b c
1 4 5 9
2 8 6 10
3 12 7 11
#the result should be
a b c
1 2.5 3.5 6
2 5 4.5 7
3 7.5 5.5 8
Can anyone direct me down the right path?
Thanks in advance
Tim Howard
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