[R] adding two colmns of a data frame

From: ozgrerg <ozgrgun_at_gmail.com>
Date: Sat, 16 Apr 2011 13:22:10 -0700 (PDT)

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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