Hello,
> Now I have changed the file to a new file as RData.csv file and now when I
> use the below code it gives me an error
> graph<- read.csv("RData.csv", header = TRUE)
Here you read RData.csv into R as a data frame named graph.
> MonthlyWeight<-by(RData$Weight,names.arg = RData$Month,sum)
So here you need to refer to that data frame using the name you gave it.
Your problem looks like a lack of basic understanding of how R works.
Here are a couple of sources that might help you get started:
http://www.burns-stat.com/documents/tutorials/impatient-r/
http://cyclismo.org/tutorial/R/
Sarah
--
Sarah Goslee
http://www.functionaldiversity.org
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