[R] summarize values in R

[Rui Barradas]

Hello,

Please send your questions to r-help at r-project.org, the odds of you 
getting more and better answers are greater.

And, why don't you use ?dput to post your data?

As for your question, it seems that ?aggregate solves the problem.

dat <- read.table(text = "
ua ELM PRP
122C MO 5
122C BR 3
122C FA 1
122C MO 1
122D BR 7
122D MO 2
122D BR 1
", header = TRUE)

aggregate(PRP ~ ua + ELM, data = dat, FUN = sum)

Hope this helps,

Rui Barradas

Em 11-03-2014 10:11, catalin roibu escreveu:
> Dear Rui,
>
> I have a new problem with R. How can I do this summarize the ELM PRP for
> each ua.
> My data is like this:
>
> ua	ELM	PRP
> 122C	MO	5
> 122C	BR 	3
> 122C	FA	1
> 122C	MO	1
> 122D	BR	7
> 122D	MO	2
> 122D	BR	1
>
>
> and I want to obtain something like this:
>
> ua	ELM	PRP
> 122C	MO	6
> 122C	BR	3
> 122C	FA	1
> 122D	BR	8
> 122D	MO	2
>
>
> Thank you very much!
>
> --
> ---
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> Forestry Faculty of Suceava
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