[R] Sum according observation

[John Kane]

?aggregate

 with(xx,aggregate(var2, list(var1=var1),sum)

--- On Fri, 9/18/09, MarcioRibeiro <mestat at pop.com.br> wrote:

> From: MarcioRibeiro <mestat at pop.com.br>
> Subject: [R]  Sum according observation
> To: r-help at r-project.org
> Received: Friday, September 18, 2009, 11:18 AM
> 
> Hi listers,
> I have a simple doubt...
> I need to manipulate the data base as:
> 
> var1 var2
> 7      0.1
> 7      0.1
> 8      0.12
> 10    0.15
> 12    0.18
> 20    0.31
> 
> I would like to aggregate the equal cases as var1 making
> the sum of var2...
> I would get...
> 
> var1 var2
> 7      0.2
> 8      0.12
> 10    0.15
> 12    0.18
> 20    0.31
> 
> Thanks in advance,
> Marcio
> -- 
> View this message in context: http://www.nabble.com/Sum-according-observation-tp25510566p25510566.html
> Sent from the R help mailing list archive at Nabble.com.
> 
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