R help - Apr 2011 - adding two colmns of a data frame

It seems very simple but I could not find the way. I just want to add two
columns of a data frame. I am doing the below operation: 

data$C=transform(data, data$A+data$B)

However that return as a data frame. I will be glad if ypu help. Thanks a
lot






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Sorry, sorry for taking your time. I solved the problem. 

data=transform(data,C= A+B)

It is so simple. But if you dont know it is hard. Again sory for taking time


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You mean like this?
mydata <- data.frame(aa=1:5, bb=1:5)
mydata[,3] <- mydata[,1] + mydata[,2]
mydata

--- On Sat, 4/16/11, ozgrerg <ozgrgun at gmail.com> wrote:
> From: ozgrerg <ozgrgun at gmail.com>
> Subject: [R] adding two colmns of a data frame
> To: r-help at r-project.org
> Received: Saturday, April 16, 2011, 4:22 PM
> It seems very simple but I could not
> find the way. I just want to add two
> columns of a data frame. I am doing the below operation: 
> 
> data$C=transform(data, data$A+data$B)
> 
> However that return as a data frame. I will be glad if ypu
> help. Thanks a
> lot
> 
> 
> 
> 
> 
> 
> --
> View this message in context:
http://r.789695.n4.nabble.com/adding-two-colmns-of-a-data-frame-tp3454556p3454556.html
> Sent from the R help mailing list archive at Nabble.com.
> 
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