Hi,
I have the following data.frame:
data.frame(x = c(1:10), y = rnorm(10,2,1), label = rep(c('a', 'b', 'c', 'd',
'e'),2))
in this data.frame there is a label-variable containing strings.
Each string is represented two times.
Now I would like to have the mean of the corresponding x (and y-values) for
every unique label-element.
For the label 'a' for example there is an x value of 1 and 6.
So the resulting value should be 3.5.
How can I do this in R?
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