Hi,
could you provide an example for the data in "sample"? (incidentally,
note that sample is already the name of a built-in function)
I'm guessing you could do something like,
library(doBy)
summaryBy(count~ID, data= count_myData, FUN=sum)
tested with,
count_myData <- data.frame(ID=rep(c(1:4),each=4),
count=abs(ceiling(rnorm(16,8,4))))
hope this helps,
baptiste
On 29 Mar 2009, at 17:54, gianni lavaredo wrote:
Dear R user,
Thanks for this sunday attention about my problem. I have a
data.frame like
this example:
count_myData
ID: 1,1,1,1,2,2,2,3,3,3,3,3,4,4,4,4,4,4
count: 4,4,4,4,3,3,3,5,5,5,5,5,6,6,6,6,6,6
this data.frame derived from this code
count_myData <- ddply(sample, .(ID), transform, sum = sum(Z >=0,
na.rm = T))
with this I have the number of sample inside of area with ID 1, ID 2
ID 3
etc etc.
Now I need a data.frame like this
new_myData
ID:1,2,3,4
count:4,3,5,6
Thanks Gianni
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Baptiste Auguié
School of Physics
University of Exeter
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