On Oct 29, 2009, at 3:12 PM, Federico Abascal wrote:
Hi,
I am investigating a problem for which I found no solution.
I have a matrix with two columns. I have plotted it as an x-y plot
(plot(matrix[,1],matrix[,2])
But this is not apropriate for my purposes. I need to group the data
in matrix[,1] into groups (as an histogram would do). Then I have to
calculate the average of matrix[,2] for each group.
?boxplot # you get the median instead of the mean.
Perhaps:
boxplot(matrix[,1],matrix[,2])
Before starting with loops and loops I would like to know if is
there some way to do this easily with R.
Thanks in advance!
Federico
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