[R] x-y plot as an histogram

[David Winsemius]

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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David Winsemius, MD
Heritage Laboratories
West Hartford, CT