Hi John.
This would have to be a data frame (not a matrix) as you could not have
different data types in your matrix. Try the function aggregate, e.g.:
obj<-data.frame(number=c(1,1.5,0.2,0.8,1.0,3.2),
tree=factor(c("A","A","B","C","A","B")))
obj ## data frame
aggregate(obj$number,by=list(obj$tree),sum)
- Liam
Liam J. Revell, Associate Professor of Biology
University of Massachusetts Boston
web: http://faculty.umb.edu/liam.revell/
email: [email protected]
blog: http://blog.phytools.org
On 5/30/2016 12:13 PM, John Denton wrote:
Hi all,
I have a two-column matrix, containing trees in one column and a numeric value
associated with each tree in the other column. I would like to go through the
list to identify any duplicated topologies, and for each set of duplicates sum
the corresponding numeric values and prune away the duplicate trees.
For example,
1.0 A
1.5 A
0.2 B
0.8. C
1.0. A
3.2. B
Would become
3.5. A
3.4. B
0.8. C
Any help would be great!
Thanks,
~John
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