[R] conditional sum two dataframes
gunter.berton at gene.com
Thu Jul 26 23:49:30 CEST 2012
The values need not be a data frame as the number of unique months
could be different among the columns, right?. So you're going to have
to rethink your data structure. Probably as a list.
Once you get that straight,?tapply and friends should make it trivial,
if I understand you correctly.
On Thu, Jul 26, 2012 at 10:49 AM, jcrosbie <james at crosb.ie> wrote:
> I have two data frames. One with a matrix of months and the other with a
> matrix of values. The two dataframes correspond to each other. I would like
> to sum up all the values in by month.
> What would be an efficient way to do this?
> months <- data.frame(a,b,c)
> values <- data.frame(a,b,c)
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Genentech Nonclinical Biostatistics
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