Like This?
x<-rep(c(1,15),10)
y<-rnorm(20)
z<-c(rep("auto",10),rep("bus",10))
a<-rep(c(1,1,2,2,3,3,4,4,5,5),2)
#Create Data frame
Df<-data.frame(Source=x,Rate=y,Bin=a,Type=z)
Df
ddply(Df,c('Type','Bin'),summarise,Summed=sum(Rate))
# Adding a column to Df
ddply(Df,c('Type','Bin'),mutate,Summed=sum(Rate))
# Convert the result to a list
dlply(Df,c('Type','Bin'),summarise,Summed=sum(Rate))
Felipe D. Carrillo
Supervisory Fishery Biologist
Department of the Interior
US Fish & Wildlife Service
California, USA
http://www.fws.gov/redbluff/rbdd_jsmp.aspx
----- Original Message ----
> From: LCOG1 <jr...@lcog.org>
> To: r-help@r-project.org
> Sent: Tue, May 17, 2011 9:48:36 AM
> Subject: [R] Summarize by two or more attributes
>
> Okay everyone heres a likely softball for someone.
>
> Consider the following data frame:
>
> #Create data
> x<-rep(c(1,15),10)
> y<-rnorm(20)
> z<-c(rep("auto",10),rep("bus",10))
> a<-rep(c(1,1,2,2,3,3,4,4,5,5),2)
> #Create Data frame
> Df<-data.frame(Source=x,Rate=y,Bin=a,Type=z)
>
>
> I want to create a new column the equals the sum of the Rates for each type
> (1,15) by Bin.
>
> A related question: I have been using R for a while now and usually
> manipulate my data in data frames but i know lists are better for R so
> perhaps the above should be done using lists. Feel free to offer
> suggestions coming from that angle.
>
> Thanks guys
>
> JR-
>
>
>
> --
> View this message in context:
>http://r.789695.n4.nabble.com/Summarize-by-two-or-more-attributes-tp3529825p3529825.html
>
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> R-help@r-project.org mailing list
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
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